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

Claim 2:
3. A gold alloy composition for jewellery manufacture, wherein the gold alloy is a 21-carat gold alloy having a specific gravity of 16.502 g/cc; hardness of 200-225 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 magnesium,
0.01 to 1.5% by weight of titanium,
0.01 to 1.5% by weight of zirconium,
0 to 12.47% by weight of copper,
0 to 3.05% by weight of zinc, and
0 to 3.05% by weight of Silver;
wherein zinc and silver are present in equal amounts by weight in the gold alloy composition.