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The 3309 cm–1 Series in Sapphire and Ruby: A Focus on FTIR Peak Position Variation
Investigates the correlations between peak positions in the 3309 cm–1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.
Appendix 3: Calculation Method for Tourmaline Species Classification Used Here
Fireworks in Ruby
“Boomerang” Inclusion in a Rough Topaz
Carbon Dioxide in a Brown Diamond
Suspended Crystal in Red Spinel
New Production of Sapphire from Matepwende, Tanzania
Unusual Patterns in Diamonds Composed of Dark Micro-Inclusions
Multilayered Laboratory-Grown Diamond
Unique Moiré-Pattern Metallic Inclusion in Paraíba Tourmaline
X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls
The distinction of natural from cultured pearls traditionally has been based on X-radiography.
Paraíba-Like Synthetic Sapphire
Two flame-fusion synthetic sapphires with a Paraíba-like color are examined at GIA’s Carlsbad lab.