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The carat or karat (US) refers to the purity of gold. 24 kt is 100% gold, but is too soft to be made into jewelry that will last. 18 kt is (18/24) or 75% gold and 25% other metals. 14 karat is 14/24 (about 58 %) gold, and about 42 % other metals.

Having the other metals, gives gold jewelry its durability as well as color, depending on what is chosen for the other metals.

Carats for diamonds refer to the weight of the diamond. 1 ct is 200 milligrams or 1/142 ounce.

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Q: What is the difference between 14 and 18 carats?
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