Pakistan — Gem Origins Overview

Pakistan occupies a key position in the Himalayan collision zone, where the
convergence of the Indian and Eurasian plates has produced a diversity of gem
deposits unparalleled in a comparable geographic area. ^[1] Three distinct geological
settings host different gem types: marble-hosted corundum in Hunza/Gilgit-Baltistan,
talc-carbonate ophiolite-hosted emerald in the Swat Valley, and calcite-vein pink
topaz at Katlang. Pegmatitic aquamarine and tourmaline from the Skardu region
complete Pakistan's gem portfolio.

• Hosted in carbonatised ultramafic rocks of the Indus suture zone; Cr sourced
  from ophiolitic chromite
• Chromian muscovite and three-phase fluid inclusions are diagnostic
• Low Li (<200 ppmw) shared with Colombian and Afghan emerald
• See dedicated file: origin/pakistan/emerald

• Marble-hosted; low-Fe, high-Cr chemistry analogous to Mogok
• Strong red LWUV fluorescence; calcite and carbonate inclusions
• Small-scale artisanal production; laboratory separation from Mogok requires
  LA-ICP-MS trace element fingerprinting
• See dedicated file: origin/pakistan/ruby

• Colour caused by trace Cr³⁺ — rare in topaz globally
• Chromium colouring is the key diagnostic distinguishing from irradiation-induced
  pink topaz or Mn-coloured topaz
• See dedicated file: origin/pakistan/topaz

Pakistan is one of the world's finest aquamarine sources:

• Host: Granite pegmatites intruding high-grade metamorphic and granitic rocks
  of the Karakoram; Baltistan and Gilgit-Baltistan produce world-class aquamarine,
  rubellite, green tourmaline, and kunzite
• Quality: Skardu-region aquamarine is among the finest globally — typically
  deeply coloured, large crystals with good clarity ^[2]
• Origin determination: No distinctive chemical fingerprint for trade-level
  origin determination beyond provenance documentation; properties are within the
  normal species range