Cartier's 36.6mm watch is part of the house's newest 'Ballon Bleu de Cartier' collection, named after the cabochon that floats like a balloon at the side. Flawlessly assembled with 18-karat gold and stainless steel links, this refined timepiece has a silvered guilloché opaline dial outlined with black Roman numerals and blued steel sword-shaped hands. It's perfect for special milestones and passing down to future generations.