Tanzanite

Tanzanite is a relatively new gemstone that was discovered in the late 1960s in Tanzania. Since its discovery, it has become increasingly popular, largely due to its attractive blue-violet color. Tanzanite is considered a rare gemstone, with deposits only found in a small area in Tanzania. This has contributed to its high demand and popularity.

Tanzanite is one of the birthstones of the month of December. Tanzanite has been marketed as a special gemstone for a variety of occasions, such as anniversaries and birthdays. Its unique color and rarity have made it a desirable option for jewelry, and it is often used as a center stone in engagement rings and other pieces of fine jewelry. 

The value of tanzanite is determined by a variety of factors, including its color, clarity, cut, and size. Like all gemstones, the value of tanzanite can vary widely based on the specific characteristics of each individual stone.

Color is one of the most important factors that affects the value of tanzanite. The most highly prized color is a rich, velvety blue-violet. Stones with a more muted or brownish color are generally less valuable.

Clarity is also an important factor. Tanzanite is often included, so the presence of inclusions can affect the value of the stone. Stones with fewer and smaller inclusions are typically more valuable than those with many or large inclusions.

The cut of the stone is another important factor. A well-cut tanzanite will have good symmetry and proportion, which can enhance the color and clarity of the stone and increase its value.

Finally, the size of the stone can also affect its value. Larger tanzanite stones are relatively rare, so they tend to be more valuable than smaller stones.

In general, tanzanite can range in price from a few dollars per carat to several thousand dollars per carat, depending on the specific characteristics of the stone.