C. 1990. Sparkling with a rich, forest hue, this Estate collection ring features a 1.18 carat round green tourmaline at the center, surround… C. 1990. Sparkling with a rich, forest hue, this Estate collection ring features a 1.18 carat round green tourmaline at the center, surrounded by a fiery circle of .80 ct. t.w. round diamonds. Crafted in beaming platinum. 1/2" wide. Diamond and green tourmaline ring. Exclusive, one-of-a-kind Estate Jewelry.