Opal Round Pendant Chain Necklace Oval Synthetic Opal Pendant Necklace Alloy Chain for Her Opal Pendant Necklace Genuine Opal Gemstone Opal Pendant Necklace Australian Opal Jewellery Online Store Sterling Silver Opal Pendant & Chain Opal Necklace Opal Gift UK. 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)