This Extremely Rare 10-Carat Blue Diamond Could Fetch $20 Million at Auction
The extremely rare, 10-carat Mediterranean Blue diamond could fetch a whopping $20 million at Sotheby's High Jewelry auction ...
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30 Most Famous Gemstones, From Least to Most Expensive
The Cartier jewelry company set the 25-carat ruby into a ring ... A gem dealer from New York, Martin Ehrmann, bought the rare gem in the 1930s and sold it to Mrs. Edith Hagging de Long in 1937.
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35 Most Valuable Gemstones, From Least to Most Expensive
Highlights: This is an extremely rare gem in the Taaffeite family ... After 1947, when DeBeers (the diamond mining company) launched a wildly successful ad campaign with the slogan, "A diamond ...