Cartier's 'Tank Française' watch is a true investment – nearly a century after its inception, it's updated with a streamlined chain-link bracelet strap that comfortably sits against your wrist. Skillfully crafted in Switzerland from polished stainless steel, it has a square dial that's inspired by French architecture and framed with 24 brilliant-cut diamonds, totaling 0.49-carats. It's tipped with a spinel-embellished crown to complement the blued steel sword-shaped hands.