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  • Diamond jewelry by Harry Winston, Van Cleef and Arpels, Tiffany Co., Chopard and Cartier at auction by Jewel Fields. Catawiki exclusive gemstone and diamond auction online. No reserve auctions for diamonds in rare pink blue green color, biggest size diamonds, HRD certified diamonds, untreated diamonds for sale, top quality diamonds at auction house for auctions by bidding, flawless 100 carat diamond, 4ct pink diamond ring and other jewelry by top jewelers in world at auction in London sold to highest bidder. Fancy color and fancy cut real diamonds for auction, fancy shape pear modified brilliant FL VVS diamond for sale under hammer / biggest round shape diamond for sale by Graff.