Gemstone district

Rio Grande do Sul Amethyst Districts

Volcanic geodes in southern Brazil have supplied major quantities of Amethyst crystals and faceting rough.

Evidence statusPublished & sourcedLast reviewed August 18, 2026
OverviewGeologyGem relationshipsSources

Evidence-backed overview

The place, clearly defined

Volcanic geodes in southern Brazil have supplied major quantities of Amethyst crystals and faceting rough.

Geological context

How the occurrence is understood

Volcanic geodes in southern Brazil have supplied major quantities of Amethyst crystals and faceting rough.

Bidirectional relationships

Documented gemstones

Occurrence and production are separate claims. A production label is date-bounded and does not guarantee quality, origin determination, or market value.

Historic production

Amethyst

Authoritative evidence documents production in a past period; present activity is not implied.

Historic production documented

Sources document production in a past period; current production is not asserted.

Evidence[1]

Evidence ledger

Sources & verification

Sources are deduplicated across the geographic record. Current-production claims receive explicit review dates; a map point never substitutes for geological or production evidence.

  1. [1]
    David Epstein. Amethyst Mining in Brazil.

    Gems & Gemology · 1988

    View authoritative source