At $57 million, this is now the world's most expensive diamond. At 2.9 grams, gram per gram, the only thing more expensive is Californium 252 and Antimatter. : r/VeryExpensive
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Californium is a precious stone that cost 27.1 million dollars in the world market, and it is found in large quantity in Bòrno state Nigeria, but we only talk about oil. Who is mining Californium in ...