We are offering Tanzanite Stones. tanzanite, one of the most popular blue gemstones available today, occurs in a variety of shapes and sizes and also provides a striking assortment of tonal qualities. rarely pure blue, tanzanite alsmost always displays its signature overtones of purple. in smaller sizes, tanzanite tends towards lighter tones, and the lavender color is more common. in larger sizes, tanzanite typically displays deeper, richer color.