An example of sheer creativity, this AAA tanzanite ring is nothing less than a piece of art. Tanzanite is a blue-violet variety of the mineral zoisite and is a thousand times rarer than diamonds. Its colors vary from deep, dark royal blue with flashes of red to light cornflower or periwinkle blue. Spectacularly decked with diamonds, the sterling silver with platinum finish beauty can be paired with any casual or formal ensemble for a stylish appearance. Natural properties of mined gemstones offer a slight difference in color saturation, hue, and tone. Gemstone images may not always capture these slight differences. Colorless diamonds require no enhancements. Normal care. Diamonds rate 10 on the Mohs scale.