Gold Jewelry is stamped with the the Karat(K) or in Europe, a number such as 750 (75% gold purit, see above table) for 18K, to indicate its gold content. The Karat marking also has a hallmark or trademark near it that identifies its maker. Also the country of origin may be included.
There is X-ray fluorescence instrumentation available to test the karat measurement of precious metals and finished jewelry. These machines allow a karat gold measurement without damaging fine jewelry.Some can also accurately determine the element composition of gold jewelry including gold, platinum, silver, paladium, rhodium and related alloys.
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