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Gold and precious metals

Gold

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Gold is a beautiful and imperishable metal. It was one of the first metals to be mined because it commonly occurs in its native form (100% Pure)

Gold

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Pure (100%) gold is too soft, and it is usually mixed with other metals (gold alloys) to make it stronger and more usable for jewelry.

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   The metals that are mixed with pure gold for strength can also modify the color of gold resulting in different shades of yellow, white, and pink.

Kt (KARATS) - Indicate the amount of pure gold in the metal.

% gold	USA	World Wide
37.5	9 kt	375
41.7	10 kt	417
58.5	14 kt	585
75	18 kt	750
100	24 kt	999

There are some of the factors that determine the value of a gold jewelry piece

weight:
gold is sold by weight - grams(gr) or pennyweights(dwt), the heavier the piece, the higher the gold content, therefore it is more expensive.
design:
designer jewelry is more expensive, especially if it is a one of a kind piece.
finish:
special finishes to the metal such as matte, or sand-blasted finish add to the cost of the gold jewelry piece.