Field report · 145
How to buy amethyst: a US buyer's guide
What to look for in commercial amethyst — color, clarity, origin, treatment — and how to read the price.
Most amethyst sold in the US comes from a handful of countries, each with a recognizable look. Knowing what you're paying for starts with the basics: color, clarity, origin, and whether the stone has been heat-treated.
Color is the primary driver of price
The best commercial amethyst is a saturated reddish-purple with no gray cast. Lighter stones (the trade calls them "Rose de France") cost roughly a third of dark Siberian-grade material. The deepest stones come from Boa Vista (Rio Grande do Sul, Brazil), Anahí (Bolivia), and a few small Zambian mines.
Clarity matters less than you think
Cabochon-grade material tolerates veiling and color zoning that would be unacceptable in a faceted stone. If you're buying a working stone for setting, judge by overall hand and feel — small internal features rarely show under a bezel.
Origin shapes color, not value
Brazilian amethyst is the workhorse — affordable, abundant, reliable. Uruguayan amethyst is denser, darker, and almost never heat-treated. Zambian material has a slight green-purple shift in daylight. Madagascar produces both rough and faceted at the lower end of the price band.
Treatment: heating is universal at low grades
Commercial amethyst that goes lighter than purple is sometimes heated to make citrine. The reverse is also true — some pale amethyst is heated to deepen color. Reputable houses (including this one) disclose treatment on every listing. If a seller won't confirm, assume heating.
What to expect to pay (2026, US)
- Light commercial cabochon: $20-60 per stone
- Dark Brazilian cabochon: $80-180
- Faceted oval, 1-3ct: $40-120/ct
- Display specimen, palm-sized: $120-400
- Museum-grade Uruguayan geode: $1,500+
For most buyers, a dark, eye-clean Brazilian cabochon in the $100-200 range is the sweet spot — enough quality to enjoy, not enough premium to feel buyer's remorse if it isn't perfect.