It is a gemstone that ranges in the lavandar to purple color range (depending on the quality of the stones). Tanzanite has begun to gain popularity in the past few years, but is expensive to purchase in the states.
I purchased a beautiful tanzanite tennis bracelet on our Carribean cruise a couple of years ago. My advice (I'm not a big jewlery buyer) is look up tanzanite on the internet to get an idea of the look and current U.S. price range. Go to a jewlery store near home to educate yourself on whatever type of jewel you will be shopping for.