DSC06813 Opal Round Pendant Chain Necklace Sterling Silver Opal Pendant & Chain Opal Necklace Opal Gift UK Sterling Silver Blue Opal Oval Pendant & Chain Opal Necklace UK Opal Pendant Etsy. 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)