Burmese 'Pigeon's Blood' Rubies: Mogok Valley Geology, Rutile Silk & Chromium UV Fluorescence
The pinnacle of red corundum: marble-hosted geology in Myanmar's Mogok Valley, intense chromium luminescence, and unheated ruby auction records.
Burmese rubies from the historic Mogok Stone Tract have commanded the highest price per carat of any colored gemstone in auction history, exemplified by the record-setting Sunrise Ruby.
1. Geological Origin of Mogok Rubies
The Marvel of Chromium vs. Iron
Mogok rubies formed within low-iron crystalline marble deposits. Because iron acts as an optical fluorescence quencher, the absence of iron combined with high chromium (Cr3+) concentrations causes Mogok rubies to fluoresce intensely red under natural ultraviolet daylight.
- Microscopic Rutile Silk: Intersecting needles of rutile (TiO2) oriented at 60-degree angles scatter light evenly throughout the gem, creating a velvety glow.
- Color Nomenclature: The traditional Burmese term ko-twe ('pigeon's blood') describes a vivid, saturated red with a subtle bluish overtone and fiery red fluorescence.
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