Christie’s Announces the Largest and Most Valuable Private Jewellery Collection to Come to Auction See Heidi Horten's incredible pieces from Harry Winston, Bulgari, and more. By Grant Mobley
The Rock: Largest White Diamond Ever Auctioned at Christie’s Sells for $21.9 Million At 228.31 carats, "The Rock" lead the Geneva Magnificent Jewels sale on May 11. By Grant Mobley
