Platinum and diamond ring, Nardi. Photo Sotheby's Set with a modified square-cut diamond weighing 6.43 carats, the mounting accented by round diamonds weighing .75 carat, size 6, signed Nardi. Estimation 100,000 — 150,000 USD Accompanied by a Letter of...

A diamond ring. Photo Christie's Image Ltd 2012 Set with a modified square-cut diamond, weighing approximately 19.51 carats, to the circular-cut yellow diamond prongs with pear-shaped diamond detail, to the circular-cut diamond shoulders and hoop, mounted...