Unisex Cartier Tortue in 18k with factory original double row diamond bezel & diamond lugs. Manual Fine Pre-owned Cartier Watch. Certified preowned Cartier Tortue watch is made out of yellow gold on a Gold Link band with a 18k Deploy buckle. This Cartier watch has a 33 x 33 mm case with a Tonneau caseback and Silver Roman Numeral dial. It is Gray and Sons Certified Authentic and comes backed by our 12-month warranty. Each watch is inspected by our certified in-house Swiss-trained watchmakers before shipment including final servicing, cleaning, and polishing.