Clockwise from top: Antique diamond bow brooch set in platinum, $28,000; antique emerald-cut aquamarine ring set in platinum with diamond shoulders, $19,500; gold-mounted malachite and onyx table box, $25,000; vintage sapphire, emerald, and diamond cluster earrings, $32,500; antique chased gold box with diamond-set cipher of King Louis Philippe, $48,000. alvr.com