Many of the world’s most expensive and dazzling gem diamonds are superdeep diamonds, making them invaluable physical samples from the convecting mantle hundreds of kilometers beneath our feet. Until recently, it was widely held that superdeep diamonds are always small and never of gem quality. This notion is upended by the present discovery that blue boron-bearing diamonds are superdeep, in addition to the 2016 finding that relatively large and pure diamonds are also superdeep.
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