A Gorgeous Antique Garnet Cabochon Diamond Ring, Vintage Art Deco circa 1920 in 18K White Gold, a Wonderful Wedding Ring Idea. This beautiful antique ring holds a stunning rich red cabochon garnet gemstone measuring about 6 x 9mm oval. The stone is set in a beautifully designed antique Art Deco setting composed of 18K white gold as tested. The ring holds 4 beautiful sparkling white diamonds. Overall the ring measures about 3/8 inch long by about 5/8 inch wide from side to side. Ring Size: about 3 (could be resized by your jeweler or ask me about using mine before shipping). This ring was acquired through an estate collection and is in lovely vintage condition.