Jewelry alloy compositions

Details Jewelry alloy compositions Jewelry alloy compositions

2005-08-16

2005-08-16

King, Roy (Department: 1742)

Alloys or metallic compositions

Gold base

C148S430000

Reexamination Certificate

active

06929776

ABSTRACT:
A jewellery alloy, having a substantially purple hue and sufficient toughness to withstand Rockwell 3 hardness testing with a 100 kg load without shattering, comprises 76 to 83.5 wt % gold and 16.5 to 21.5 wt % aluminum. In one embodiment, the alloy consists of more than 78.5 wt % gold (but not more than 83.5 wt %) and a balance or aluminium. In another embodiment, the alloy comprises an additional element selected from palladium and nickel.

REFERENCES:
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patent: 083026 (1987-10-01), None
patent: 59093847 (1987-10-01), None
patent: 085076 (1998-03-01), None
Cahn, Robert W. “A precious stone that isn't”, Nature, vol. 396, Dec. 1998, pp. 523-524.
Cretu, Cristian and van der Lingen, Elma, “Coloured Gold Alloys”, Gold Technology, vol. 30, Winter 2000, pp. 31-40.
“Precious Metals”, edited by Benner et al, pub. by The International Precious Metals Institute, 1991, pp. 443-447.
English abstract of JP 59-093847 A (Takiguchi).
English abstract of JP 62-240729 A (Miyama).
International Search Report PCT/SG00/00013 AU—Apr. 18, 2000.

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