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When Tiffany & Co. acquired an exceptional 71-carat rough vivid yellow diamond from Canada’s Ekati mine last summer, instead of cutting and setting it in a jewel as expected, its chief gemologist, ...

It’s unusual for Tiffany to tour a rough diamond, but this was a geological wonder, said Reynolds. “It’s very rare to find a diamond of this size and saturated color that came from hundreds of miles ...