Apatite is a common mineral, gem-quality apatite is quite rare. Apatite is known by gemstone connoisseurs especially for two colors; the Paraiba-like blue-green, and the leek-green color that once earned apatite the name 'asparagus stone.' There is also a very rare deep purple apatite, found in the aptly named Mount Apatite in Maine, USA.
Gem-quality apatite is found in a number of places in the world, including Burma, Brazil and Mexico. The neon blue-green material is found chiefly in Madagascar. When evaluating an apatite gem, color saturation is very important, since the more intense the color, the most valuable the gem. Stones over one carat are rare and will command higher prices in the market. It is unusual to find clean apatite; most pieces have at least some inclusions.