Gemstone district

Luc Yen Gem District

Gem district known for spinel and corundum, including cobalt-bearing blue and purple spinel.

Evidence statusPublished & sourcedLast reviewed August 17, 2026
OverviewGeologyGem relationshipsSources

Evidence-backed overview

The place, clearly defined

Gem district known for spinel and corundum, including cobalt-bearing blue and purple spinel.

Geological context

How the occurrence is understood

Gem district known for spinel and corundum, including cobalt-bearing blue and purple spinel.

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.

Major source

Spinel

Evidence identifies the location as commercially or historically important for this gem.

Production not assessed

Occurrence is documented, but production status has not been assessed.

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]
    Philippe M. Belley and Aaron C. Palke. Purple Gem Spinel from Vietnam and Afghanistan: Comparison of Trace Element Chemistry, Cause of Color, and Inclusions.

    Gems & Gemology · 2021

    View authoritative source