A state gem (or gemstone, mineral, rock) is a geological symbol officially designated by a U.S. state legislature to represent its natural heritage. 35+ states have one.
| State | Gem / Mineral / Rock | Significance |
|---|---|---|
| North Carolina | Emerald & Ruby (dual) | Only state with two; Hiddenite (emerald) & Cowee Valley (ruby) mines. |
| Tennessee | Freshwater Pearl | Tennessee River mussels; only state with organic gem. |
| Arizona | Turquoise | Iconic Southwest; Kingman, Bisbee mines. |
| California | Benitoite | Rare blue barium titanium silicate; only gem-quality source (San Benito Co.). |
| Colorado | Rhodochrosite | Sweet Home Mine (Alma) – "Alma Rose" specimen. |
| Montana | Sapphire & Agate | Yogo Gulch sapphires (cornflower blue); Montana agate. |
| Nevada | Virgin Valley Black Fire Opal | Unique play-of-color; Humboldt Co. |
| Oregon | Sunstone | Copper-included feldspar; Plush, Lake Co. |
| Texas | Blue Topaz | Mason Co.; also state stone: Petrified Palmwood. |
| Utah | Topaz | Topaz Mountain (Thomas Range) – sherry/amber crystals. |
Typically: school class / rockhound group proposes → legislator sponsors bill → committee → governor signs. Often includes educational component.
State gems celebrate geology, history, and local pride—one faceted symbol at a time.