78.78 Carats Untreated Tanzanite and Diamond Ring ~ M.S. Rau Antiques.

Weighing an astonishing 78.78 carats, this awe-inspiring natural Tanzanite dazzles with its incomparable and prized violet blue color. The jewel is formed in a cushion-shape with a modified brilliant cut, and has been certified by the American Gemological Institute (AGL) not to have undergone any clarity or thermal treatment, meaning the beauty of this incredible Tanzanite is completely natural. Set in its stunning platinum and 18K gold ring, this rare gemstone is accentuated by 2.80 carats of shimmering white diamonds. To find an untreated specimen of such outstanding size and quality is to discover one of nature's truest treasures. Price: $228,500

Found only in the African country of Tanzania for which it is named, Tanzanite is prized for its striking blue color. This intriguing stone, also known as blue zoisite, was discovered in 1967 by Masai shepherds. These first crystals were offered to Tiffany & Co., where the gem was renamed and introduced to the excitement of collectors everywhere.

M.S. Rau Antiques.