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WordReference Random House Unabridged Dictionary of American English © 2024Hope′ dia′mond, - Jewelrya 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.
- after Henry Philip Hope (died 1839), English gem collector, who once owned it
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