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Ruby
Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire.
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Research
Sea Urchin–Like 3D Radial Fissures in a Heated Mong Hsu Ruby
Examination of a 1.34 ct ruby reveals a unique inclusion formed during heat treatment.
Evil Eye in a Flux-Healed Mong Hsu Ruby
The mirror reflection of a flux-healed fissure from a step pavilion facet in a Mong Hsu ruby creates an interesting inclusion scene.
Devitrified Glass “Pom-Poms” in Ruby
Devitrified glass inclusions resembling pom-poms or sea urchins are observed in a clarity-enhanced ruby.
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.
Ruby with Synthetic Overgrowth Lining Cavities
An unusual area of granular texture lining the cavity of a ruby indicates synthetic overgrowth.
Arzakite Inclusion in Ruby from Mogok
A report on the first documented arzakite inclusion in a Mogok ruby.
Natural-Looking Inclusions in a Ramaura Synthetic Ruby
Milky clouds and flux inclusions in a synthetic ruby create a challenge for identification.
Update on Inclusion Scenes in Mozambican Rubies
GIA researchers identify zircon inclusions in several Mozambican ruby samples, potentially impacting origin determination criteria used for sources of East Africa ruby.
Update on Liberian Ruby
Ten Liberian corundum samples are examined in GIA’s Tokyo laboratory.
Translucent Ruby Filled with Zinc Glass
Examination of a heart-shaped ruby reveals a zinc glass filler.
Liberian Ruby
A trip to a rural Liberian diamond mining community results in a newly discovered source of corundum.
