750 Yellow Gold (18 kt) Laser-cut logo on the side Lobster claw clasp Length 45 cm (17.71 inches) adjustable to 43 cm (16.92 inches) and 41 cm (16.14 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.