Solid Gold Opal Pendant 18K Gold Round Opal Dainty Opal Etsy Oval Synthetic Opal Pendant Necklace Alloy Chain for Her Opal Pendant: Oval White Opal in Silver Frame on Chain Pendants 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)