Blue Topaz Cubic Zirconia JC 925 Sterling Silver Necklace 18" Box Included ~ NIB 18 Inch Stirling Silver Box Chain , Sterling Silver Pendant 4.2g.TW. Birth stone of November Scorpio JC 925 sterling silver refers to jewelry items made from high-quality silver (92.5% pure silver and 7.5% alloy) that feature a "JC" maker's mark or brand stamp, often found on rings, pendants, and, in some cases, high-end pieces