925 Sterling Silver Ring Cushion Cut Cubic Zirconia Engagement SZ 5 2.5-3 Carat. This beautiful piece has 27 1.0mm cubic zirconias around the larger center one. The center measures 9mm x 9mm about 2.5 x 3 carat. This ring is size 5. This piece has rhodium plating. Rhodium is a silvery-white metal in the platinum family. It has highly reflective quality that does not tarnish. Rhodium is allergy-friendly, harder than gold, and extremely durable. This metal is idea for jewelry plating as it strengthens the durability and adds a glorious sheen to the metal below it. Stamped 925. Please view the pictures as they are part of the description.