Save3 days LeftAntique Art Deco Platinum Diamond Ring 1.30ct Marquise Baguette RoundDiamond Depot4.3(10)Est. $7,374-$8,628$3,000
SaveBuy NowVintage Platinum GIA 4.54ct Paraiba Tourmaline Diamond Cocktail RingBidhaus4.2(837)$12,160(16 bids)
SaveBuy Now5.18ct GIA Certified Star Sapphire Platinum Cocktail Ring with DiamondsBidhaus4.2(837)$3,360(20 bids)
SaveBuy NowPlatinum GIA 3.42ctw No Heat Color Change Sapphire Ring with Diamond HaloBidhaus4.2(837)$8,450(13 bids)
SaveBuy NowPlatinum GIA Certified 1.7ct Color Change Garnet & Diamond Flower RingBidhaus4.2(837)$3,820(28 bids)
SaveBuy NowPlatinum 2.29ctw Black Boulder Opal Diamond Cluster Cocktail RingBidhaus4.2(837)$1,950(15 bids)
SaveBuy NowEGL Certified 6.02 Ct Platinum Diamond Ring with 2 Additional DiamondsBidhaus4.2(837)$29,920(1 bid)
Save3 days Left9k Rose Gold and Platinum Antique Diamond Knot Motif Stick PinDiamond Depot4.3(10)Est. $1,102-$1,289$450
Save4 days LeftVintage GIA Certified 3.65ctw No Heat Cushion Sapphire Diamond Ring in PlatinumDiamond Depot4.3(10)Est. $16,341-$19,119$6,600
SaveBuy NowPlatinum GIA 3.42ctw No Heat Color Change Sapphire Ring with Diamond HaloBidhaus4.2(837)$8,450(22 bids)
SaveBuy NowTiffany & Co. Platinum 2mm Half Circle Diamond Band Ring Size 4Bidhaus4.2(837)$3,460(21 bids)
SaveEnds in 10d 21hCHRISTOPHER KAUFMANN, BLUE ZIRCON AND DIAMOND RINGFreeman's4.4(1.7k)Est. $3,000-$5,000$1,500
SaveBuy NowVintage GIA Certified 3.25ct Emerald Diamond Ring in PlatinumBidhaus4.2(837)$4,740(14 bids)
SaveBuy NowVintage Platinum Turquoise Diamond Halo Pendant Necklace Adjustable ChainBidhaus4.2(837)$2,250(15 bids)
SaveBuy NowPlatinum GIA Certified 2.98ct No Heat Star Ruby Diamond Ballerina RingBidhaus4.2(837)$8,450(14 bids)
SaveBuy NowDavid Webb Platinum 18K Yellow Gold Turquoise Ruby Diamond PendantBidhaus4.2(837)$32,850(21 bids)
SaveMar 08, 2026VINTAGE PLATINUM ENGAGEMENT RING 5.54CT. NATURAL CUSHION BLUE SAPPHIRE GIA CERTModern Jewelry4.5(204)Est. $20,315-$22,705$16,500
Save18 hrs LeftGIA Certified 45.84ctw Sapphire Fancy Yellow Diamond Brooch in Platinum GoldDiamond Depot4.3(10)Est. $84,451-$98,808$20,750
SaveBuy NowDavid Webb Vintage Platinum 18K Gold Amethyst Diamond EarringsBidhaus4.2(837)$16,490(12 bids)
Save2 days LeftAntique Edwardian 0.85ctw Diamond Filigree Floral Bar Brooch Platinum GoldDiamond Depot4.3(10)Est. $3,797-$4,443$1,100
SaveBuy NowTiffany & Co. 0.53ct Round Diamond Engagement Ring in Platinum with CertificateBidhaus4.2(837)$4,700(18 bids)