What does the word emerald mean?

Usage examples for emerald

  1. Did you see the square emerald she wore last night? – The Vertical City by Fannie Hurst
  2. You were good to me, Random, you dear boy, and on the impulse of the moment I took the emerald to you. – The Green Mummy by Fergus Hume
  3. I told him that I had given the emerald to you, Random, and that I had confessed all in writing. – The Green Mummy by Fergus Hume