Amethyst Necklace. This Handmade necklace features a handset 7mm x 5mm Faceted Natural AAA Grade Amethyst stone set in a 925 Sterling Silver 6 prong setting. 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. Amethyst, a purple form of Quartz is the birthstone for February.