Star K Round 7mm Simulated Orange Mexican Fire Opal Good Luck Dolphin Pendant Necklace Sterling Silver Metal: 925 Sterling Silver. Dimensions: Width: 15.00 mm Length: 25.00 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. 18 inch Chain in a matching metal will be included Additional Stones: