M.S. Rau Antiques carries one of the world's finest selections of rare, untreated emerald estate jewelry including exquisite Art Deco emerald rings, necklaces, bracelets and earrings in a wide variety of shapes and cuts. From large emerald rings to pear shaped emerald necklaces complimented with yellow gold and diamonds, M.S. Rau showcases some of the finest estate jewelry around. Natural, untreated emeralds are amongst the rarest and most precious of all gemstones, particularly those hailing from the mines of Colombia. Our selection of these fine gemstones is unparalleled and we are pleased to offer these unique, natural emeralds for sale.