Blue color zoning observed in some of the unusual rubies; immersed in
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Russian crystal-growth laboratories are now producing hydrothermal
Sapphire Gem Guide and Properties Chart
Chemical composition of danburite from Luc Yen, Vietnam.
Color Change Garnet Emerald Cut 1.46 Carat - Rare Gemstone Company
PDF) Challenging Synthetic Rubies Examined in GIA's Bangkok and Hong Kong Laboratories
The infrared spectrum of powdered danburite from Luc Yen shows a broad
Sri Lanka Gem Online
PDF) Challenging Synthetic Rubies Examined in GIA's Bangkok and Hong Kong Laboratories
Understanding Common Corundum Treatments
C. Le gisement de rubis de Nangimali Top (Azad Kashmir, Pakistan)
Color Change Garnet Emerald Cut 1.46 Carat - Rare Gemstone Company
What's up with my sapphire ring? Is this normal discoloration? : r/Gemstones
Man In a Can
