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K (Karat) - measurement of purity used in showing the fineness of gold. One karat is one twenty-fourth pure gold. Thus, 24-karat gold is pure (.999 fine). Example: 14 gold is 14 parts gold and 10 parts alloy (other metals).
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Kashmir Sapphire - a deep cornflower blue sapphire, having a milky semi-transparent appearance caused by minute liquid inclusions.
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Keshi Pearls - naturally occurring non-nucleated pearls which form in a mollusc when it is returned to the water after the removal of a crop of non-nucleated cultured pearls.
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Kingfisher Jade - a bluish-green jadeite.
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King's Coral - a black coral also called akabar.
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Kismet Pearls - trade name for imitation pearls.