Hope diamond

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.

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