Angara Natural Opal Necklace Prong Set Round Opal Pendant Necklace Opal Pendant Necklace Genuine Opal Gemstone Opal Pendant Necklace Boulder & Lightning Ridge Opal Opal Necklace Pendant Pearl Surrounded with Rose Gold Chain 45cm Huge. Includes: A matching box. Style: Minimalist Material: 925 sterling silver, platinum plated, opal Care: Avoid wearing during exercise, as sweat will react with the jewelry to produce silver chloride and copper sulfide, which causes the jewelry to deteriorate and corrode over time. Imported Gemstone origin: Australia Product measurements: Chain length: 15. 7 in Extension chain length: 2 in Weight: 0. 06 oz (1. 7 g)