Discovered after intense fire, this novel gem stone is prized for its rich, rare color. When buying Tanzanite jewelry, the most important factor to consider is the color, as this will be the determining factor in the stone's value. Most Tanzanite is free from visible inclusions, although they are present from time to time. The most valuable stones do not have visible inclusions. Tanzanite is available in a variety of shapes and carat weight ranges.
Smaller stones are generally lighter in color saturation, while larger stones are usually darker.
Tanzanite is a variety of the species Zoisite. Some stones appear more violet, and most will display both colors depending on the light source. Smaller stones generally display lighter lavender hues, while larger stones are often richer in color saturation. In its natural form, Tanzanite exhibits reddish-bronze hues, which are considered undesirable and unmarketable. Tanzanite is not a particularly durable stone and should be protected from knocks or blows, which could cause it to chip.