Three Stone Diamond Victorian Style Ring For Sale at 1stDibs Antique Gold and Three Stone Diamond Ring, Ideal for Engagement at Three Stone Diamond Engagement Ring For Sale at 1stDibs Antique Victorian 3 Stone Diamond Ring Old Mine Vintage 14 Karat Gold 0.75 Carat Vintage 3 Stone Diamond Ring Set in 14 Karat White Gold at Antique Diamond Three Stone Ring Aladdin's Cave Jewellery. 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.