In a letter dated October 13, 1942 Queen Elizabeth wrote to her mother-in-law Queen Mary: "I must tell you that Mrs. Greville has left me her jewels, tho' I am keeping that quiet as well for the moment!" http://www.theroyalpost.com/2013/10/...reville-jewels
Princess Eugenie of York wore the Greville Emerald Kokoshnik Tiara for her wedding to Jack Brooksbank at Windsor Castle. The tiara was lent to her by her grandmother The Queen. The tiara is made of brilliant and rose cut diamonds pavé set in platinum, with six emeralds on either side. Greville Emerald Kokoshnik Tiara.