RocksdayIdaho State Gem: Star garnet
Idaho's state stone, or state gem is star garnet, adopted in 1967. Idaho's state gemstone cut is the Idaho cut, adopted in 2022. Idaho's state fossil is the Hagerman horse fossil (Equus simplicidens), adopted in 1988. Idaho's state dinosaur is Oryctodromeus, adopted in 2023.
Symbol names and dates are taken from primary state sources linked below. Informal or proposed symbols are not listed unless adopted.
State stone, or state gem: Star garnet
- Adopted:
- 1967
- Law:
- Idaho Code § 67-4505
- Variety:
- star garnet
It is a variety of garnet. Garnet is a mineral with a Mohs hardness of 7–7.5 and a vitreous luster, usually red or brown.
Often confused with: Almandine, Analcime, Corundum
Also an official symbol of: Connecticut, New York
State gemstone cut: Idaho cut
- Adopted:
- 2022
- Law:
- Idaho Code § 67-4515
State fossil: Hagerman horse fossil (Equus simplicidens)
- Adopted:
- 1988
- Law:
- Idaho Code § 67-4507
State dinosaur: Oryctodromeus
- Adopted:
- 2023
- Law:
- Idaho Code § 67-4516
Idaho state symbols FAQ
What is the state stone, or state gem of Idaho?
Idaho's state stone, or state gem is star garnet, adopted in 1967 (Idaho Code § 67-4505).
What is the state gemstone cut of Idaho?
Idaho's state gemstone cut is the Idaho cut, adopted in 2022 (Idaho Code § 67-4515).
What is the state fossil of Idaho?
Idaho's state fossil is the Hagerman horse fossil (Equus simplicidens), adopted in 1988 (Idaho Code § 67-4507).
What is the state dinosaur of Idaho?
Idaho's state dinosaur is Oryctodromeus, adopted in 2023 (Idaho Code § 67-4516).
Does Idaho have a state rock or mineral?
No. Idaho's state symbols law (Idaho Code title 67, chapter 45) names the star garnet as the state stone, or state gem, but has no state rock or state mineral.
Sources
We cite primary sources (statutes, state government pages, federal regulations, and land-manager sites). Third-party listicles are not used as citations.
- Idaho Code title 67, chapter 45, State symbols — Idaho Legislature (accessed 2026-10-24).
Last verified 2026-10-24. Corrections welcome: if a statute has changed, tell us and we'll re-verify.
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