750 Yellow Gold (18 kt) with semi-precious stones Semi-precious stones: 1 Green Quartz - Weight: 1.80 ct / 1 Amethyst - Weight: 1.90 ct / 1 Swiss Blue Topaz - Weight: 2.40 ct Triangle logo Lobster claw clasp Length 18.5 cm (7.28 inches) adjustable to 17.5 cm (6.88 inches) and 16.5 cm (6.49 inches) Hypoallergenic and nickel-free materials Made in Italy Each step of Prada&#39;s responsible gold and diamond production chain is verified and traceable thanks to Aura Blockchain technology.