A Cartier watch is a luxury timepiece crafted by the famous French jewelry and watchmaking house Cartier, which was founded in Paris in 1847. Known for elegant shapes rather than traditional round cases, Cartier created iconic models like the Tank, Santos, Ballon Bleu, and Panthere. Collectors and celebrities prize these watches for their timeless style, Roman numeral dials, blue steel hands, and sapphire cabochon crowns.