Purple gold is produced when gold and aluminium are alloyed together in the ratio 79:21 by weight. In this ratio they form a gold inter-metallic compound with the chemical formula AuAl2. The gold alloy formed has a purple, amethyst or violet colour. This purple gold alloy can be hallmarked as 18k gold. There are a number of processes that can produce purple gold. Vacuum Melting, Physical Vapour Deposition (PVD), Powder Metallurgy, Vacuum Melting, Diffusion Bonding, Thermal Diffusion, Thermal Spraying, Mix Gold Chloride with Rochelle Salt. The conventional jewellery application of purple gold is in form of cast and ground items, which are set similar to gemstones.
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