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Karat (K)

A measure of the purity of gold out of 24 parts.

Detailed Definition

Karat (often abbreviated as 'K' or 'kt') measures the ratio of pure gold to other alloyed metals on a scale of 24. 24K gold is 99.9% pure, 22K contains 22 parts gold and 2 parts alloy (91.6% pure), 21K is 87.5% pure, and 18K is 75% pure. 22K is the standard alloy used for durable jewelry in South Asia and the Middle East.

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