Menswear-inspired watches have a certain understated charm - whether they're borrowed from your boyfriend or passed down from your dad, their simplicity makes them versatile enough for almost any occasion. A unisex style, Cartier's 'Ballon Bleu' design is made from 18-karat rose gold and stainless steel and has curved edges for a comfortable fit. This classic timepiece takes its name from the suspended beryl-hued cabochon sphere that's nestled at the side and set with 0.09-carats of diamonds for a touch of shimmer.