Если брать белое золото (всё те же 14 или 18 карат), то там сплав золота, серебра и платины (по одному из рецептов).Platinum Family White Gold AlloysThe platinum family refers to the group of platinum metals. In most cases, 10k and 14k white gold use palladium, a member of the platinum family. 18K white gold, however, sometimes uses platinum in place of palladium. Many jewelers believe the use of either palladium or platinum gives the gold a warmer white tone than other alloy mixtures. It also makes a softer metal that is easy to shape, which is one of the reasons why many white gold jewelry pieces use platinum family metals.