Patent ID: 11970762
Assignee: nan
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 10:
11. A gold alloy composition for jewellery manufacture, wherein the gold alloy is a 21-carat gold alloy having a specific gravity of 16.55 g/cc; and a hardness of 200-210 Vickers HV-0.05 ASM F 384-11, the gold alloy composition consisting essentially of:
87.5 to 88% by weight of gold,
0.01 to 1.5% by weight of zirconium,
0.01 to 1.5% by weight of magnesium,
0 to 12.48% by weight of copper,
0 to 12.48% by weight of zinc, and
0 to 12.48% by weight of silver.