ANSWERS: 4
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10k (or 10 karat) gold is an alloy that is 10/24 (or about 43.7%) gold and 14/24 other metals. Usually they use copper and silver so it still looks "golden".
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It means that it's only 42% real gold. http://www.goldintomoney.com/precious-metals/how-to-read-gold-karats-and-understand-gold-color
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10 parts gold, 14 parts alloying metal.
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10 part gold and 14 parts mystery metal. 10k is harder than 14k an much harder than 18k.
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