Star K Sterling Silver Octagon Solitaire Engagement Promise Ring Metal: 925 Sterling Silver. Dimensions: Width: 10.00 mm Length: 11.00 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 AMETHYST: The Simulated Birthstone for February. The name comes from the Greek `amethystos` meaning `sober`. A symbol of trust, since roman times, Amethyst is thought to protect against seduction and provide peace, love, and happiness. Additional Stones: