Cartier Tank Américaine Watch in 18k Yellow GoldThis beautiful Cartier womens watch features a . 20 carat blue sapphire in 18 karat yellow gold. From the expert Swiss craftsmanship of Cartier designers, the watch is comfortable to wear and water resistant. The hours of the dial feature painted Roman numerals, encased in 18K yellow gold. One (1) . 20 carat blue sapphire decorates the crown of the watch. Complete with a dark leather strap, this Cartier timepiece is a collectable work of art.