ISO 6893:2024 宝飾品・貴金属 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 174, Jewellery and precious metals.

Introduction

ISO 24016 describes the terminology, the classification and test methods that apply for the grading of polished diamonds over 0,25 ct (carat). This category is commonly named “large diamonds” as opposed to the category of “small diamonds”.

From an economic perspective, on the jewellery and watchmaking industries, the low price of each single small diamond – compared to that of a large diamond - is widely compensated by the enormous quantity of small diamonds used.

As for a large diamond, the quality of a small diamond is mainly defined by its carat mass, its colour, its clarity and its cut. But, specifically the inspection of small diamonds faces one main challenge. They are sold by batches, sometimes as large as 10 000 units. When these batches are homogeneous, an inspection per sampling is possible.

This document is proposed to companies involved in the small diamond trade and willing, in the frame of their commercial relationship, to agree on both a defined quality and its inspection methodology.

It is agreed by both parties that the batches that are supplied for inspection by sampling are on a level of the supply chain that provides the necessary homogeneity. Small diamonds are already controlled in different countries and today there is a need for harmonizing the technical principles of inspection of small diamonds. This harmonization will benefit the jewellery and watchmaking industries in large, because their reputations are inextricably linked to a stringent compliance with their product quality specifications.

This document aims to clarify and ease the relationship between diamantaires and companies decorating their products with small diamonds, which consequently strengthens the end consumer confidence in the jewellery, watchmaking and all other luxury industries.

This document completes ISO 18323 and ISO 24016.

1 Scope

This document specifies the terminology, classification and test methods that are used for the inspection of batches of unmounted polished colourless diamonds with single mass smaller than or equal to 0,25 ct (carat).

While the inspection of a batch is made one diamond at a time, the use of this document is not to be claimed for one single diamond only nor for fancy coloured diamonds, nor for synthetic diamonds, nor for treated diamonds, neither for assembled stones.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 18323, ISO 24016 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

Bibliography