As of February 2015, the highest quality tanzanite is worth approximately $400 per carat. This tanzanite is deemed AAA+ quality which renders it to be the best. Tanzanite that has a rating of AAA quality, which is still considered exceptional quality, has a price of approximately $250 per carat.
Tanzanite is a dark violet-blue gem stone that originates from Tanzania. The quality ratings are based off of the saturation of the gem; a more intense color has a higher rating and a higher price. Clarity is also taken into consideration when the gems are given ratings. The highest clarity gems are flawless to the unaided eye; a higher clarity means a higher rating and a higher price.