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Rare form Clockwise from top: Bulgari 18-k pink-gold necklace with mother-of-pearl and diamonds, $62,000; Paolo Costagli 18-k yellow-gold ring with diamonds, $16,000; Vhernier “Calla” 18-k rose-gold earrings, $5,900; David Webb “Neon Lights” 18-k gold and platinum ring with diamonds, $38,000; Roberto Coin 18-k rose-gold bangle with diamonds, $7,500; Vhernier 18-k yellow-gold cuff with diamonds, $34,950;...