Lab Created Sapphire Stud Earrings. These stud earrings are handmade of 5 mm faceted Lab Created Sapphire 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). Polishing cloth for all jewelry included. Shipped in gift box. Sapphire is the birthstone for September.