Really fine Tanzanite is not only hard to find, but expensive! Most Tanzanite doesn't really look that special. It is a pretty violet/blue, but isn't really a rare or expensive stone. Small, pale tanzanites are plentiful, but very inexpensive. The Tanzanite on the right is not only large (7.70 carats) but is also a rare quality blue. If you look closely at the picture, there are a few surface abrasions that pop out when you put the Tanzanite under magnification. The color, however is gem quality and very rare. The blue is a deep rich blue with no violet shades at all apparent. This oval Tanzanite is an older piece, most likely from the 1970's. Old for Tanzanite is relatively new, since the gem was discovered in 1967 at the foot of Mount Kilimanjaro in the country of Tanzania, hence the name, Tanzanite. Selling common, low quality Tanzanite is frustrating, since it is available new a relatively low prices. You can't get much for it since you can buy it new at ever decreasing pricing. However, rare bluish Tanzanite is very rare and has excellent resale value. When I sell this Tanzanite, I'll recommend the buyer put it in a pendant, since it is a soft gemstone, not really suitable for rings.