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by Avro Arrow on September 28th, 2009
The correct answer all depends on the meaning behind the question. As for the most expensive SINGLE gemstone? It's going to be one of two stones at the Smithsonian. Either it will be the Hope Diamond or their 65.7 carat Alexandrite. As for what is the most expensive gemstone type, it is the Alexandrite. Top specimens of this stone are worth $100,000USD per carat.
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