Although garnet is commonly associated with the color red, these gemstones can be found in almost any color and are popular choices for jewelry of all types. That’s excellent news if you’re in the market for this January birthstone. The garnet family is one of the most complex in the gem world. It’s not a single species but rather consists of several species and varieties. This gem listing will focus on qualities common to all garnets and offer a brief overview of their diversity.