Cartier 18ct rose-gold necklace. 18ct rose gold. Lobster clasp fastening. Chain length 420mm. Inner diameter 16mm. Cartier prides itself on providing excellent customer service. This includes contacting customers to offer after-sales care and share details about its brand and products. As such, when you order a Cartier product from us, your details will be passed onto Cartier so that it can provide these services to you.