Star K 8mm Cushion Cut Solitaire Ring with Simulated Opal Sterling Silver Metal: 925 Sterling Silver. Dimensions: Width: 8.00 mm Length: 8.00 mm This beautiful design is part of the exclusive Star K. Jewelry collection. Star K, is a reputable American Family Business based in New York since 1986, uses only the highest quality materials, and will proudly stand behind all of her products. Simulated Opal: The Simulated Birthstone for October. From the Greek `opallios`, meaning `colour change`. A symbol of hope and faithfulness for the rainbow locked within it, it inspires true love and brings confidence. Lifetime Warranty exclusively offered by Finejewelers. High End Jewerly Box and Gift Packaging Additional Stones: