Patent ID: 6406568
Filing Date: 2002-06-18
Classification: C22C,C22F

Abstract:
An 18-karat green gold alloy composition, comprising:about 75.0% gold; about 6.0-7.0% silver; about 9.0-11.7% copper; about 6.5-9.0% zinc; and wherein the hardness of said composition is capable of being selectively changed between its annealed-hardness value obtained by heating said composition to about 1150Â° F. for about thirty minutes followed by a water quench, and its aged-hardness value obtained by heating said composition to about 550Â° F. for about one hour and thereafter being permitted to cool in air and wherein the color of said composition is between about 1.5 to about âˆ’3.0 CieLab a* color units, and between about 19 to about 26 CieLab b* color units.