Large Cartier Tortue Riviere watch, tonneau-shaped 18kt white gold case with a transparent sapphire crystal back and 18kt white gold bracelet fully set with round brilliant diamonds, silver grained guilloche dial with black Roman numerals, blue steeled apple-shaped hands, #430 Caliber mechanical movement with manual winding, octagonal crown set with a diamond, scratch-resistant sapphire crystal, water resistant to 30 meters.