Standard gold is 24 carat (100% pure gold with millesimal fineness 999), 22 carat or millesimal fineness 916, ie., 91.6% pure gold and the rest includes metals like copper and silver. 14k is 58.33% (millesimal fineness 583) purity gold. Gold is also sold in 18ct or millesimal fineness 750 (75% pure gold).
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