Barstow's Three Stone Engagement Ring If you love vintage rings, Barstow's Three Stone Engagement Ring was made for you! Classic design features a 1.5 carat round cut cubic zirconia center stone in an elegant prong setting. Round cut .15 carat side stones add luster and sparkle, and four tiny CZs along the top half of the band add even more sparkle. The band is rhodium electroplated sterling silver for the timeless style of platinum.