Platinum Prong-Set Three Stone Round Diamond Engagement Ring Mount. Ring features two round side diamonds (0.62 tcw). Shown here with 7mm 1.5ct center CZ. High polish finish, size 6.25. Price is for mount only in sizes 4.5 – 6.5. Center diamond and other custom stone and ring sizes available upon request. Platinum Prong-Set Three Stone Engagement Ring Mount