BS EN ISO 8654:2018,Jewellery – Colours of gold alloys – Definition, range of colours and designation.BS EN ISO 8654:2018 pdf free download here.
In the manufacture and sale of articles made of or coated with gold alloys, the colour of the surface of the product is an important characteristic.
EN ISO 8654:2018 will enable the purchaser to define his requirements with precision by referring to the designations given within this document and so avoids the need for purchasing orders to be accompanied by colour samples.
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.
The samples to be measured shall have a flat and polished surface to be used as a measurement area.
The measurement area shall be exempt of defect.
The finishing (polishing and washing) shall be (re)done until a mirror surface is achieved (Y reaches a
constant value).
After polishing, the sample colour measurement shall be made within 120 min maximum.