Sterling Silver London Blue Topaz and Diamond Jewelry Set Necklace chain is 18". Ring is size 7 and is 23 by 20 mm. Earrings are 20.2 by 10.5mm. Stones in earrings are 6mm and stones in ring and pendant are 8mm. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free. Imported