Carat for carat, rubies and emeralds generally outprice the common diamond. Certain rare specimens of diamond, however, will eclipse even the priciest examples of those other gemstones. While some priceless gems exist, such as the world famous Hope Diamond, these are the most expensive diamonds ever sold. The Wittelsbach-Graff Diamond – $23.4 million The Wittelsbach-Graff [...]
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