Jewelry Trends Sterling Silver Created Blue Opal Key To My Heart Pendant on 18" Box Chain Necklace Crafted of .925 Sterling Silver with a high polish rhodium plated finish Stone: Created opal; Stone measurements: 4.4 mm wide x 8.4 mm long, 5.4 mm wide x 4.7 mm long Pendant dimensions: 13.4 mm wide x 20.0 mm long Box chain dimensions: 0.8 mm wide x 18 inches long; Clasp: Spring ring Complimentary gift box included