Marquise and Baguette-Cut White Cubic Zirconia Platinum over .925 Silver Engagement Ring Platinum Over Sterling Silver. Quality Stamp (.925) 21 Cubic Zirconia Stones Item Measures 14 mm Wide x 5.5 mm High x 15 mm Long. 1.5 mm Shank Width Style: Engagement/Anniversary. Imported Dazzled with fiery marquise-cut cubic zirconia, this spectacular ring is a glitter-girl look sparkling even brighter with round and tapered princess-cut and round cubic zirconia accents. 1.65 carats T.W. Platinum over sterling silver. Sizes 6-10.