Gold purity

18K Gold Price

Pure 24k gold is valued from the live spot price of $4,167.69 per troy ounce. Lower karats multiply that value by purity.

Karat	Purity	Per Gram	Per Troy Ounce
10K	41.67%	$55.83	$1,736.54
14K	58.33%	$78.16	$2,431.15
18K	75.00%	$100.50	$3,125.77
22K	91.67%	$122.83	$3,820.38
24K	100.00%	$133.99	$4,167.69

18K gold contains 75.00% gold by weight, so its melt value is $100.50 per gram before buyer discounts or refining costs.