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

Claim 7:
8. A gold alloy composition for jewellery manufacture, wherein the gold alloy is a 18-carat gold alloy having a specific gravity of 14.74 to 14.78 g/cc; and a hardness of 235-265 Vickers HV-0.05 ASM F 384-11, the gold alloy composition consisting of;
75 to 75.5% by weight of gold,
at least two of:
0.01 to 1.5% by weight of zirconium,
0.01 to 1.5% by weight of titanium, and
0.01 to 1.5% by weight of magnesium,

0 to 24.98% by weight of copper,
0 to 24.98% by weight of zinc, and
0 to 24.98% by weight of silver.