Field report · 649
Domestic US gemstones: where to find them
Twelve gemstones produced commercially in the United States — and where each one comes from.
The US imports most of its gemstones but also produces a meaningful diversity of stones domestically. Knowing which species come from where in the US adds a layer of provenance to gem-buying that's often overlooked.
By species and location
- Turquoise (Arizona, Nevada, New Mexico) — Sleeping Beauty (Globe, Arizona, closed 2012, finite supply driving price up), Kingman (still active), Lone Mountain Nevada, Cerrillos NM
- Tourmaline (California, Maine) — historically Pala (CA) for pink tourmaline; Maine's Mount Mica for green; smaller current production
- Kunzite (California) — discovered at Pala in 1902, still a primary source; named after gemologist George Kunz
- Sapphire (Montana, North Carolina) — Yogo Gulch (Montana) for cornflower blue; Rock Creek (Montana) for fancy colors; NC for native heat-treated
- Opal (Nevada, Oregon, Idaho) — Virgin Valley (Nevada) for black opal; Owyhee (Oregon) for blue opal; Idaho for various
- Amethyst (Arizona, Colorado, Maine) — Four Peaks Arizona (active mine, premium material); Crystal Park Colorado
- Smoky quartz (Colorado) — Pikes Peak (Mount Antero region) for the famous "morion" black-smoky
- Sunstone (Oregon) — Plush, Oregon — the only commercial source of "Oregon sunstone" with red/green flash
- Garnet (New York, Arizona) — Adirondack garnet (NY); Wrangell-St. Elias area Alaska
- Topaz (Texas, Utah) — Mason County Texas (state gem); Topaz Mountain Utah
- Petrified wood (Arizona, multiple states) — Petrified Forest National Park material is preserved; private-land collection of similar is legal
- Various jaspers and agates — Oregon (multiple varieties), Wyoming (Wyoming jade, sweetwater agate), Arizona (apache tears, fire agate)
The collector market for US material
Domestic material trades at a premium in the US for several reasons:
- Provenance verifiability — easier to verify a Montana sapphire is from Montana than to verify a Madagascan one
- Collector interest — locality-specific specimens are a major collector segment
- Ethics — US labor standards, environmental regulations apply
- Story — domestic stones have stories that travel well
Buying tips
- Verify the source — "Montana sapphire" should come with lab certification or chain-of-custody documentation; some imported sapphire is mislabeled
- Expect premium pricing — domestic material costs 1.5-4x equivalent imported material
- Look for specialty dealers — many US deposits are sold through small specialty dealers; the major Tucson shows have dedicated American gem rooms
- Consider state geologic surveys — many state geological surveys publish guides to gem locations within their borders for prospecting