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There are no "magic" gold alloys. Most use the same alloys, only making small increases/decreases to the % to affect the color. Silver, copper, and zinc are the alloys used in almost all yellow gold alloys. Varying the % changes the color. More copper makes rose/pink, more zinc makes green. White gold alloys generally remove the silver, and add nickel, unless it's a white gold/palladium alloy.
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