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Motselisi Khasake holds a diamond cut from the Lethoso Promise, the 15th-largest diamond ever discovered, in London at Graff Diamonds International. Just five years ago, colorless diamonds of 10 carats or more were being sold to dealers at $70,000 per carat. "Now we're paying over $200,000 per carat," said Francois Graff of Graff Diamonds. (Bloomberg News)