AA Grade London Blue Topaz Studs. These stud earrings are handmade of 5 mm diameter AA Grade London Blue Topaz faceted stones in a 925 Sterling Silver low profile 4 prong setting. Two types of 925 Sterling backs are included for preference or just to have a backup pair (Rubber core bullet style and traditional friction catch). Free polishing cloth safe for all types jewelry included. Shipped in gift box. Topaz is the Birthstone for November