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Hope diamond

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noun
  1. a sapphire-blue Indian diamond, the largest blue diamond in the world, weighing 44.5 carats and supposedly cut from a bigger diamond that was once part of the French crown jewels: now in the Smithsonian Institution.
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Origin of Hope diamond

after Henry Philip Hope (died 1839), English gem collector, who once owned it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018