CARTIER five Diamonds Trinity Ring Cartier Vintage Rose, Yellow and White gold diamond trinity ring size: US 7.5 / 55. This ring is crafted of 18 karat tri-color gold interlocking bands accented with 5 round brilliant cut diamonds. weight. Each band measures 3.80 mm. Total weight: 10 grams. Stamped: "750" "Cartier" "55" and Serial number. Very good conditions, minor surface scratches. Rings are engraved from the inside as seen on the pictures. Upon Request, Auction House may provide an appraisal. This will carry an additional cost. Appraisals are made by our in house GIA certified Gemologist.