Ladies Antique Art Deco Platinum Filigree Three Stone Diamond Vintage Three Stone Diamond Ring The Vintage Jeweller Yellow Gold Diamond Vintage Bypass Ring 14k Round .50ctw Three Stone Antique Three Stone Diamond Ring For Sale at 1stDibs. A vintage trilogy ring. Set with three old brilliant cut white diamonds, centre 3mm and each side a 2. 4mm diamond. Total estimated at 0. 20 carats, colour H j, clarity Si All diamonds set in to a platinum head , 11x4mm , square design, early 20th century. Weight 2. 2grams. Stamped 18CT PT, tests as 18 carat gold, platinum shoulders, no hallmarks required for this period Size K, we can resize free of charge.