Tanzanite is found in what geologists call boudins, or sausage-shaped formations. Not every boudin will produce tanzanite, and many that do contain low-grade material that is not useful for jewelry. These boudins make straight, horizontal shafts within the earth that are impractical for mining.

Cutting skills can enhance the beauty of tanzanite, bringing out its brilliance and colorful hues. Tanzanite may be mounted in any form of jewelry, but when set in rings, gentle wear is recommended. Tanzanite should never be subjected to high heat such as jeweler's torches or ultrasonic cleaners.