Patent ID: 7413705

Claim:
A 14-karat rose-colored gold alloy composition, comprising: about 58.5% gold; about 9.0-12.0% silver; about 0.0-0.2% zinc; about 0.3-0.4% cobalt; about 0.0-0.02% iridium; about 29.0-33.0% copper; wherein the hardness of said composition is capable of being selectively changed between its annealed-hardness value, obtained by heating the composition to about 1150° F. for about thirty minutes followed by a water quench, and its age-hardness value, obtained by heating said composition to about 600° F. for about one and one-half hours and thereafter being allowed to cool in a non-oxidizing atmosphere; and wherein the color of said composition is between about 5-7 CieLab a* color units and between about 17-21 CieLab b* color units.