A few areas in Arizona are well known for ant hill garnets. These are beautiful bright red chromium pyrope garnets with a very high color saturation. The Native Americans discovered them long ago and marveled at their color and beauty. They regarded them as special and sometimes sewed them into ceremonial rattles or gave them as tokens of appreciation.

Today, Native Americans and rockhounds collect the garnets and sell them in parcels to lapidaries who cut them into cabochons and faceted stones. The finished stones and attractive pieces of rough are sold to gem collectors and mounted into jewelry. The novelty origin of the stones adds to their appeal and can elevate their price to a higher level than what is paid for similar-quality stones from other localities.

The typical ant hill garnet is a tiny stone – almost always less than one carat when cut into a cabochon or faceted stone. The ants are smart enough to excavate around larger stones rather than haul them to the surface. This small size can actually be a blessing because many of the stones have a very high color saturation. If they were larger in size, the stones would have a very dark, almost black appearance; but in small sizes, enough light passes through them to reveal their desirable deep red color.

Ant hill garnets are novelty gems that mainly have a local popularity. The number of stones produced is far lower than what would be needed to make them a commercial gem, to be used in mass-produced jewelry with broad distribution.