As one of the most legendary American design companies, Tiffany has decorated everyone from Audrey Hepburn to Angelina Jolie with its jewels—so it has no reason to be quiet about celebrating its 175th anniversary. That explains the astonishing 175-carat cushion-cut tanzanite at the center of this necklace, created to commemorate the event. Four strands of brilliant-cut round diamonds set in platinum loop around the neck and flow into the central stone before cascading into a dazzling, shimmering waterfall. This beauty is one of a kind, so time is of the essence if it strikes your fancy— you know what they say about chasing waterfalls.—Vanessa Lawrence
From left: Hemmerle copper, tourmaline, and sapphire ring; de Grisogono 18k pink gold, rubellite, sapphire, and diamond ring; Bulgari 18k yellow gold, tourmaline, emerald, and diamond ring.