Diamond DepotNew York, NY Mynt AuctionsNew York, NY Marek Roik AuctioneerArlington Heights, IL Modern JewelryValley Village, CA Weatherham Estate TreasuresCobourg, ON Diamond DepotNew York, NY KUNSTAUKTIONSHAUS SCHLOSS AHLDENAhlden(Aller), Niedersachsen Modern JewelryValley Village, CA Weatherham Estate TreasuresCobourg, ON Mynt AuctionsNew York, NY