Peridot Quartz Sterling Silver Necklace This necklace features a Trillion cut Peridot Quartz. The Peridot Quartz is 8mm wide. The 1.3mm Flat Oval Cable Chain is Rhodium Plated 925 Sterling Silver for greater tarnish resistance. Polishing cloth for all jewelry included. Shipped in gift box. Peridot is the birthstone for August.