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39.060 - Jewellery

ICS 39.060 Details

Jewellery

Schmuckwaren

Bijouterie

Nakit

General Information

Parent
39 - PRECISION MECHANICS. JEWELLERY

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Standardization Organization
Technical Committee
Directive
Mandate
50
ISO
ISO 5724:2023(Main)
Jewellery and precious metals — Determination of very high purity gold — Difference method using ICP-MS

This document specifies an analytical procedure for the determination of very high purity gold with a nominal content of and above 999,99 ‰ (parts per thousand, by mass), using an inductively coupled plasma mass spectrometer (ICP-MS).

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SIST
SIST EN 1811:2023(Main)
Reference test method for release of nickel from all post assemblies which are inserted into pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin
EN 1811:2023

Considering amongst other topics the following: comments from Systematic review, adopt changes regarding reference material and quality control material, concentration and purity of lactic acid and the flow chart regarding Annex C, watches Round robins for reference material and quality control materials are needed.

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SIST
SIST EN ISO 11490:2023(Main)
Jewellery and precious metals - Determination of palladium - Gravimetry using dimethylglyoxime (ISO 11490:2023)
EN ISO 11490:2023

This document specifies a gravimetric method for the determination of palladium in palladium alloys. The palladium content of the sample lies preferably between 50 and 999 parts per thousand (‰). Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).
This method is also intended to be used as one of the recommended methods for the determination of fineness in jewellery alloys covered by ISO 9202.

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SIST
SIST EN ISO 11210:2023(Main)
Jewellery and precious metals - Determination of platinum - Gravimetry using ammonium chloride (ISO 11210:2023)
EN ISO 11210:2023

This document specifies a gravimetric method for the determination of platinum in platinum alloys. The platinum content of sample lies preferably between 50 and 999 parts per thousands (‰) by weight. Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).
This method is also intended to be used as one of the recommended methods for the determination of fineness in jewellery alloys covered by ISO 9202.

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CEN
EN ISO 11210:2023(Main)
Jewellery and precious metals - Determination of platinum - Gravimetry using ammonium chloride (ISO 11210:2023)
SIST EN ISO 11210:2023

This document specifies a gravimetric method for the determination of platinum on a material considered homogeneous. The platinum content of the sample lies preferably between 50 and 999 parts per thousand (‰) by mass. Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).
This method is also intended to be used as one of the recommended methods for the determination of fineness in jewellery alloys covered by ISO 9202.

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CEN
EN ISO 11490:2023(Main)
Jewellery and precious metals - Determination of palladium - Gravimetry using dimethylglyoxime (ISO 11490:2023)
SIST EN ISO 11490:2023

This document specifies a gravimetric method for the determination of palladium on a material considered homogeneous. The palladium content of the sample lies preferably between 50 and 999 parts per thousand (‰) by mass. Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).
This method is also intended to be used as one of the recommended methods for the determination of fineness in jewellery alloys covered by ISO 9202.

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ISO
ISO 11210:2023(Main)
Jewellery and precious metals — Determination of platinum — Gravimetry using ammonium chloride

This document specifies a gravimetric method for the determination of platinum on a material considered homogeneous. The platinum content of the sample lies preferably between 50 and 999 parts per thousand (‰) by mass. Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093). This method is also intended to be used as one of the recommended methods for the determination of fineness in jewellery alloys covered by ISO 9202.

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CEN
EN 1811:2023(Main)
Reference test method for release of nickel from all post assemblies which are inserted into pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin
SIST EN 1811:2023

This document specifies a method for simulating the release of nickel from all post assemblies which are inserted into pierced ears and other pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin in order to determine whether such articles are in compliance with No. 27 in Annex XVII of Regulation (EC) No 1907/2006 of the European Parliament and of the Council (REACH).
Spectacle frames and sunglasses are excluded from the scope of this document.
NOTE   Spectacle frames and sunglasses are subject to the requirements of EN 16128.

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ISO
ISO 11490:2023(Main)
Jewellery and precious metals — Determination of palladium — Gravimetry using dimethylglyoxime

This document specifies a gravimetric method for the determination of palladium on a material considered homogeneous. The palladium content of the sample lies preferably between 50 and 999 parts per thousand (‰) by mass. Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093). This method is also intended to be used as one of the recommended methods for the determination of fineness in jewellery alloys covered by ISO 9202.

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SIST
SIST-TP CEN/TR 12471:2022(Main)
Screening test for the presence of nickel in articles which are inserted into pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin
CEN/TR 12471:2022

This document provides a sceening test based upon the use of dimethylglyoxime to detect nickel release from articles that are inserted into pierced parts of the human body and those that are intended to come into direct and prolonged contact with the skin.
The screening test is suitable for manufacturers and importers as a qualitative method for inspecting articles for nickel release.
NOTE     The reference method for the measurement of nickel release in EN 1811, or for spectacle frames and sunglasses, EN 16128.

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CEN
CEN/TR 12471:2022(Main)
Screening test for the presence of nickel in articles which are inserted into pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin
SIST-TP CEN/TR 12471:2022

This document provides a screening test based upon the use of dimethylglyoxime for detecting the presence of nickel in articles that are inserted into pierced parts of the human body and those that are intended to come into direct and prolonged contact with the skin.
This screening test is suitable for manufacturers and importers as a qualitative method for detecting the presence of nickel in articles.
NOTE   The reference method for the measurement of nickel release is EN 1811, or for spectacle frames and sunglasses, EN 16128.

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ISO
ISO 11596:2021(Main)
Jewellery and precious metals — Sampling of precious metals and precious metal alloys

This document specifies a method of sampling precious metals and precious metal alloys for the determination of their precious metal content and for the assessment of their homogeneity. The document is applicable to raw materials, semi-finished products and finished products and is intended to be used only for the sampling of entirely metallic materials. NOTE 1 Standards for determination of precious metals contents for different metals are listed in the Bibliography. NOTE 2 For assaying techniques different from the listed ones other sampling procedures can be required. NOTE 3 For the purpose of production control or lot inspections the International Standards for the sampling indicated in the Bibliography or corresponding guidelines can be applied in addition.

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CEN
EN ISO 11426:2021(Main)
Jewellery and precious metals - Determination of gold - Cupellation method (fire assay) (ISO 11426:2021)
SIST EN ISO 11426:2021

This document specifies a cupellation method (fire assay) for the determination of gold on a material considered homogeneous. The gold content of the sample lies preferably between 100 and 999,5 parts per thousand (‰) by weight. Fineness above 999,5 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).
The procedure is applicable to most types of gold samples. Some modifications are indicated for specific cases (presence of large amount of base metals, platinum or palladium, silver). It is not compatible with the presence above trace levels of iridium, rhodium and ruthenium (more than 0,25 ‰ for the sum of all three elements).
This method is also intended to be used as the recommended method for the determination of fineness in jewellery alloys covered by ISO 9202.

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ISO
ISO 23345:2021(Main)
Jewellery and precious metals — Non destructive precious metal fineness confirmation by ED-XRF

This document describes a non-destructive method to verify (confirm) the precious metal fineness of finished and semifinished jewellery item(s) considered homogeneous by ED-XRF (energy dispersive X-ray fluorescence), including alloys according to ISO 9202. This document is not suitable for any coated items. WD-XRF (wavelength dispersive X-ray fluorescence) equipment cannot be used.

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SIST
SIST EN ISO 11426:2021(Main)
Jewellery and precious metals - Determination of gold - Cupellation method (fire assay) (ISO 11426:2021)
EN ISO 11426:2021

This document specifies a cupellation method (fire assay) for the determination of gold on a material
considered homogeneous. The gold content of the sample lies preferably between 100 and 999,5 parts
per thousand (‰) by weight. Fineness above 999,5 ‰ can be determined using a spectroscopy method
by difference (e.g. ISO 15093).
The procedure is applicable to most types of gold samples. Some modifications are indicated for specific
cases (presence of large amount of base metals, platinum or palladium, silver). It is not compatible with
the presence above trace levels of iridium, rhodium and ruthenium (more than 0,25 ‰ for the sum of
all three elements).
This method is also intended to be used as the recommended method for the determination of fineness
in jewellery alloys covered by ISO 9202.

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CEN
EN 12472:2020(Main)
Method for the simulation of accelerated wear and corrosion for the detection of nickel release from coated items
SIST EN 12472:2021

This document specifies a method for the simulation of accelerated wear and corrosion, to be used prior to the detection of nickel release from coated articles that come into direct and prolonged contact with the skin. According to the Commission Regulation (EC) No 1907/2006 (REACH), articles with an outer coating containing nickel and those which are inserted into pierced ears and other parts of the human body are excluded from the scope of this document.

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ISO
ISO 11426:2021(Main)
Jewellery and precious metals — Determination of gold — Cupellation method (fire assay)

This document specifies a cupellation method (fire assay) for the determination of gold on a material considered homogeneous. The gold content of the sample lies preferably between 100 and 999,5 parts per thousand (‰) by weight. Fineness above 999,5 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093). The procedure is applicable to most types of gold samples. Some modifications are indicated for specific cases (presence of large amount of base metals, platinum or palladium, silver). It is not compatible with the presence above trace levels of iridium, rhodium and ruthenium (more than 0,25 ‰ for the sum of all three elements). This method is also intended to be used as the recommended method for the determination of fineness in jewellery alloys covered by ISO 9202.

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SIST
SIST EN 12472:2021(Main)
Method for the simulation of accelerated wear and corrosion for the detection of nickel release from coated items
EN 12472:2020

This document specifies a method for the simulation of accelerated wear and corrosion, to be used prior
to the detection of nickel release from coated articles that come into direct and prolonged contact with
the skin. According to the Commission Regulation (EC) No 1907/2006 (REACH), articles with an outer
coating containing nickel and those which are inserted into pierced ears and other parts of the human
body are excluded from the scope of this document.

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ISO
ISO 24016:2020(Main)
Jewellery and precious metals — Grading polished diamonds — Terminology, classification and test methods

This document specifies the terminology, classification and the methods that are used for the grading and description of single unmounted polished diamonds over 0,25 carat (ct). This document applies to natural, unmounted, polished diamonds. It is not to be used for fancy coloured diamonds, synthetic diamonds, treated diamonds (other than is allowed for in 7.4), nor for assembled stones.

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ISO
ISO 24018:2020(Main)
Jewellery and precious metals — Specifications for 1 kilogram gold bar

This document specifies the requirements, test methods, inspection, marking, packaging, transportation, storage, quality certificate and the order (or contract) information of one kilogram gold bars. This document is applicable to one-kilogram cast gold bars produced for investment markets or industrial (jewellery, electronic) markets.

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CEN
EN ISO 8654:2018/A1:2019(Amendment)
Jewellery - Colours of gold alloys - Definition, range of colours and designation - Amendment 1 (ISO 8654:2018/Amd 1:2019)
SIST EN ISO 8654:2018/A1:2020
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CEN
EN ISO 11494:2019(Main)
Jewellery and precious metals - Determination of platinum in platinum alloys - ICP-OES method using an internal standard element (ISO 11494:2019)
SIST EN ISO 11494:2019

This document describes an analytical procedure for the determination of platinum in platinum alloys with a nominal content up to 990 ‰ (parts per thousand), including alloys according to ISO 9202.

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CEN
EN ISO 11495:2019(Main)
Jewellery and precious metals - Determination of palladium in palladium alloys - ICP-OES method using an internal standard element (ISO 11495:2019)
SIST EN ISO 11495:2019

This document describes an analytical procedure for the determination of palladium in palladium alloys with a nominal content up to 990 ? (parts per thousand), including alloys according to ISO 9202.

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ISO
ISO 15093:2020(Main)
Jewellery and precious metals — Determination of high purity gold, platinum and palladium — Difference method using ICP-OES

This document specifies the analytical procedure for the determination of gold, platinum and palladium with a nominal content of and above 999 ? (parts per thousand). This document specifies a method intended to be used as the recommended method for the determination of gold, platinum and palladium of fineness of and above 999 ?. For the determination of fineness of and above 999,9 ?, modifications described in Annex B apply.

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ISO
ISO 15096:2020(Main)
Jewellery and precious metals — Determination of high purity silver — Difference method using ICP-OES

This document specifies the analytical procedure for the determination of silver with a nominal content of and above 999 ? (parts per thousand). This document specifies a method intended to be used as the recommended method for the determination of silver of fineness of and above 999 ?. For the determination of fineness of and above 999,9 ?, modifications described in Annex B apply.

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ISO
ISO 22764:2020(Main)
Jewellery and precious metals — Fineness of solders used with precious metal jewellery alloys

This document specifies the precious metal content in solders suitable for use in the production of jewellery made of precious metal alloys.

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SIST
SIST EN ISO 8654:2018/A1:2020(Amendment)
Jewellery - Colours of gold alloys - Definition, range of colours and designation - Amendment 1 (ISO 8654:2018/Amd 1:2019)
EN ISO 8654:2018/A1:2019
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ISO
ISO 8654:2018/Amd 1:2019(Amendment)
Jewellery — Colours of gold alloys — Definition, range of colours and designation — Amendment 1
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CEN
EN ISO 9202:2019(Main)
Jewellery and precious metals - Fineness of precious metal alloys (ISO 9202:2019)
SIST EN ISO 9202:2019

This document specifies a range of fineness of precious metal alloys (excluding solders) recommended for use in the field of jewellery.
NOTE       There is a possibility that national legal requirements for the designation, marking, and stamping of finished articles exist in the respective countries.

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SIST
SIST EN ISO 11495:2019(Main)
Jewellery and precious metals - Determination of palladium in palladium alloys - ICP-OES method using an internal standard element (ISO 11495:2019)
EN ISO 11495:2019

This document describes an analytical procedure for the determination of palladium in palladium alloys with a nominal content up to 990 ‰ (parts per thousand), including alloys according to ISO 9202.

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SIST
SIST EN ISO 11494:2019(Main)
Jewellery and precious metals - Determination of platinum in platinum alloys - ICP-OES method using an internal standard element (ISO 11494:2019)
EN ISO 11494:2019

This document describes an analytical procedure for the determination of platinum in platinum alloys with a nominal content up to 990 ‰ (parts per thousand), including alloys according to ISO 9202.

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ISO
ISO 11494:2019(Main)
Jewellery and precious metals — Determination of platinum in platinum alloys — ICP-OES method using an internal standard element

 This document describes an analytical procedure for the determination of platinum in platinum alloys with a nominal content up to 990 ‰ (parts per thousand), including alloys according to ISO 9202.

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ISO
ISO 11495:2019(Main)
Jewellery and precious metals — Determination of palladium in palladium alloys — ICP-OES method using an internal standard element

This document describes an analytical procedure for the determination of palladium in palladium alloys with a nominal content up to 990 ? (parts per thousand), including alloys according to ISO 9202.

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SIST
SIST EN ISO 9202:2019(Main)
Jewellery and precious metals - Fineness of precious metal alloys (ISO 9202:2019)
EN ISO 9202:2019

This document specifies a range of fineness of precious metal alloys (excluding solders) recommended
for use in the field of jewellery.
NOTE There is a possibility that national legal requirements for the designation, marking, and stamping of
finished articles exist in the respective countries.

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ISO
ISO 9202:2019(Main)
Jewellery and precious metals — Fineness of precious metal alloys

This document specifies a range of fineness of precious metal alloys (excluding solders) recommended for use in the field of jewellery. NOTE There is a possibility that national legal requirements for the designation, marking, and stamping of finished articles exist in the respective countries.

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CEN
EN ISO 8654:2018(Main)
Jewellery - Colours of gold alloys - Definition, range of colours and designation (ISO 8654:2018)
SIST EN ISO 8654:2018

ISO 8654:2018 specifies a limited number of colours of gold alloy and the method to measure colours.
ISO 8654:2018 applies to objects made of gold alloys or coated by gold alloys.

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SIST
SIST EN ISO 8654:2018(Main)
Jewellery - Colours of gold alloys - Definition, range of colours and designation (ISO 8654:2018)
EN ISO 8654:2018

This document specifies a limited number of colours of gold alloy and the method to measure colours.
It applies to objects made of gold alloys or coated by gold alloys.

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ISO
ISO 8654:2018(Main)
Jewellery — Colours of gold alloys — Definition, range of colours and designation

ISO 8654:2018 specifies a limited number of colours of gold alloy and the method to measure colours. ISO 8654:2018 applies to objects made of gold alloys or coated by gold alloys.

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CEN
EN ISO 11427:2016(Main)
Jewellery - Determination of silver in silver jewellery alloys - Volumetric (potentiometric) method using potassium bromide (ISO 11427:2014)
SIST EN ISO 11427:2016

The method of ISO 11427:2014 describes a volumetric method for the determination of silver in jewellery alloys, preferably within the range of fineness stated in ISO 9202.
These alloys may contain copper, zinc, cadmium, and palladium. Apart from palladium, which must be precipitated before commencing titration, these elements do not interfere with this method of determination.
This method is intended to be used as the referee method for the determination of fineness in alloys covered by ISO 9202.

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SIST
SIST EN ISO 11427:2016(Main)
Jewellery - Determination of silver in silver jewellery alloys - Volumetric (potentiometric) method using potassium bromide (ISO 11427:2014)
EN ISO 11427:2016

The method of ISO 11427:2014 describes a volumetric method for the determination of silver in jewellery alloys, preferably within the range of fineness stated in ISO 9202.
These alloys may contain copper, zinc, cadmium, and palladium. Apart from palladium, which must be precipitated before commencing titration, these elements do not interfere with this method of determination.
This method is intended to be used as the referee method for the determination of fineness in alloys covered by ISO 9202.

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SIST
SIST EN ISO 11495:2016(Main)
Jewellery - Determination of palladium in palladium jewellery alloys - ICP-OES method using yttrium as internal standard element (ISO 11495:2014)
EN ISO 11495:2016

ISO 11495:2014 describes a method for the determination of palladium in palladium jewellery alloys, preferably within the range of fineness specified in ISO 9202, by means of inductively coupled plasma optical emission spectrometry (ICP-OES).
The preferred palladium content of the alloys lies between 500 ? (parts per thousand) and 950 ? palladium.
NOTE This method can be used to analyse other contents of palladium.
This method is intended to be used as the recommended method for the determination of fineness in alloys covered by ISO 9202.

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CEN
EN ISO 18323:2015(Main)
Jewellery - Consumer confidence in the diamond industry (ISO 18323:2015)
SIST EN ISO 18323:2015

ISO 18323:2015 specifies a set of permitted descriptors for the diamond industry and is specifically designed to be understood by the consumer. The Standard also includes a series of definitions which aim to provide further clarity for traders and maintain consumer confidence in the diamond industry as a whole.
ISO 18323:2015 will cover the nomenclature to be used by those involved in the buying and selling of diamonds, treated diamonds, synthetic diamonds, composite diamonds and imitations of diamonds.

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ISO
ISO 8653:2016(Main)
Jewellery — Ring-sizes — Definition, measurement and designation

ISO 8653:2016 specifies a method to measure the ring-size using a ring stick with defined characteristics, which is mainly used during manufacturing steps, and specifies the designation of the ring-size. NOTE For jeweller-consumer relationships, the finger size is measured with a finger gauge set made up of a ring for each size with the same diameter and tolerance than the ring stick ones.

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SIST
SIST EN ISO 18323:2015(Main)
Jewellery - Consumer confidence in the diamond industry (ISO 18323:2015)
EN ISO 18323:2015

This European Standard gives a single set of guidelines on the description of natural and synthetic
diamonds and is specifically designed to be understood by the consumer.
The Standard includes a set of permitted descriptors for diamonds also includes a series of definitions which aim to provide further clarity for traders.
The Standard will cover the nomenclature to be used by those involved in the buying and selling of diamonds, treated diamonds and synthetic diamonds. In particular, it will outline how to describe synthetic diamonds in a clear and accurate manner to provide clarity to the consumer and maintain consumer confidence in the diamond industry as a whole.

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ISO
ISO 18323:2015(Main)
Jewellery — Consumer confidence in the diamond industry

ISO 18323:2015 specifies a set of permitted descriptors for the diamond industry and is specifically designed to be understood by the consumer. The Standard also includes a series of definitions which aim to provide further clarity for traders and maintain consumer confidence in the diamond industry as a whole. ISO 18323:2015 will cover the nomenclature to be used by those involved in the buying and selling of diamonds, treated diamonds, synthetic diamonds, composite diamonds and imitations of diamonds.

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ISO
ISO 13756:2015(Main)
Jewellery — Determination of silver in silver jewellery alloys — Volumetric (potentiometric) method using sodium chloride or potassium chloride

ISO 13756:2015 specifies a volumetric method for the determination of silver in silver jewellery alloys, preferably within the range of fineness stated in ISO 9202. These alloys may contain copper, zinc, cadmium, and palladium. Apart from palladium, which must be precipitated before commencing titration, these elements do not interfere with this method of determination. NOTE This method is an alternative recommended method to ISO 11427.

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ISO
ISO 11427:2014(Main)
Jewellery — Determination of silver in silver jewellery alloys — Volumetric (potentiometric) method using potassium bromide

The method of ISO 11427:2014 describes a volumetric method for the determination of silver in jewellery alloys, preferably within the range of fineness stated in ISO 9202. These alloys may contain copper, zinc, cadmium, and palladium. Apart from palladium, which must be precipitated before commencing titration, these elements do not interfere with this method of determination. This method is intended to be used as the referee method for the determination of fineness in alloys covered by ISO 9202.

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SIST
SIST-TP CEN/TR 14547:2006(Main)
Sampling schemes for third party conformity assessment of fineness in precious metal articles
CEN/TR 14547:2005

This Technical Report specifies an acceptance sampling system of single sampling plans both for inspection by attributes and for inspection by variables. The attributes plans are of the accept-zero form, i.e. no lot is accepted if the sample from it contains one or more nonconforming articles. (For the purposes of this Technical Report, a nonconforming article is a precious metal article containing less than the nominal proportion by weight of the precious metal). The variables plans generally require smaller sample sizes than the attributes plans, but require the precious metal content of all the sampled articles to exceed the nominal content by at least a specified amount.
The objective of this Technical Report is to provide accept-zero schemes and procedures for assuring an upper limit to the long-term percentage of nonconforming precious metal articles in the market place (i.e. the percentage of articles reaching the market place that contain less than the nominal proportion of precious metal) by means of the lowest practicable sample sizes. The upper limit provided by this Technical Report is 1,47% nonconforming. The objective is achieved in three ways:
a)   the sample size reduces as the total number of articles accepted in all the lots since the last non-acceptance increases;
b)   if quality is consistently high, then subject to certain conditions it will be possible to switch from sampling by attributes to sampling by variables;
c)   under sampling by variables, further reductions in sample size may be achieved by switching from the unknown standard deviation method (the "s" method) to the known standard deviation method (the "s" method) if there is sufficient evidence that the process standard deviation is constant....

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CEN
CEN/TR 14547:2005(Main)
Sampling schemes for third party conformity assessment of fineness in precious metal articles
SIST-TP CEN/TR 14547:2006

This Technical Report specifies an acceptance sampling system of single sampling plans both for inspection by attributes and for inspection by variables. The attributes plans are of the accept-zero form, i.e. no lot is accepted if the sample from it contains one or more nonconforming articles. (For the purposes of this Technical Report, a nonconforming article is a precious metal article containing less than the nominal proportion by weight of the precious metal). The variables plans generally require smaller sample sizes than the attributes plans, but require the precious metal content of all the sampled articles to exceed the nominal content by at least a specified amount.
The objective of this Technical Report is to provide accept-zero schemes and procedures for assuring an upper limit to the long-term percentage of nonconforming precious metal articles in the market place (i.e. the percentage of articles reaching the market place that contain less than the nominal proportion of precious metal) by means of the lowest practicable sample sizes. The upper limit provided by this Technical Report is 1,47% nonconforming. The objective is achieved in three ways:
a)   the sample size reduces as the total number of articles accepted in all the lots since the last non-acceptance increases;
b)   if quality is consistently high, then subject to certain conditions it will be possible to switch from sampling by attributes to sampling by variables;
c)   under sampling by variables, further reductions in sample size may be achieved by switching from the unknown standard deviation method (the "s" method) to the known standard deviation method (the "s" method) if there is sufficient evidence that the process standard deviation is constant....

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SIST
SIST EN 1904:2002(Main)
Precious metals - The finenesses of solders used with precious metal jewellery alloys
EN 1904:2000

This European Standard specifies the precious metal content in solders suitable for use in the production of jewellery made of precious metal alloys.

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