Retro Vintage Champagne Topaz Diamond Platinum 18K Yellow Gold Ring. This is a beautiful retro vintage ring set with an 18 carat natural champagne color topez. The topaz has nice color and clarity. The sides of the ring have a ribbon like design with 6 old cut diamonds set into platinum. The ring shank is marked 18K. Ring size 8-1/2. The ring is in excellent condition. Weight 7.8 grams. The topez measures 17 X 13 mm.