Tommaso Design Oval 7x5mm Genuine Tanzanite Ring 14kt Gold This Classic creation is made by the renowned Tommaso Design Studio. Tommaso Design Studio, is a reputable American Family Business based in New York since 1986, uses the highest quality materials, and will proudly stand behind all of its products. Tanzanite: The Alternate Birthstone for September. Tanzanite is a rare blue gem and a popular alternative to blue sapphire. The gemstone was discovered in 1967, and it is mined at only one very small mining location in Tanzania. Width: 7.00 mm Length: 7.00 mm Additional Stones: (0.04 carat white-diamond, Shape: round-shape, Color: L-M, Clarity: I3, Creation: natural, Treatment: not-treated.)