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What are the ten most precious gemstones?

April 26, 2017earth gemstones Geology Mathematics precious sciences

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What are the ten most precious gemstones?

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There are ONLY four categories of gemstones which are called Precious Stones by geologists – Diamond, Ruby, Emerald and Sapphire. Not in that order of course, because a lot depends on several factors like carat, cut, colour and clarity. Rest of the gems are all called Semi-precious.