What is the state gemstone of Idaho?

The state gemstone of Idaho is the Star Garnet. This beautiful variety of garnet is rare and is characterized by its unique star-like appearance when polished. Star garnets are typically dark red to purple in color and are found in several areas across Idaho, particularly in the northern part of the state. The gemstone has been used in jewelry and as a decorative item for centuries. Star garnet was designated as Idaho’s state gemstone in 1967, making it the only state in the U.S. with garnet as its state gemstone.