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Ruby
Ruby is the most valuable variety of the corundum mineral species, which also includes sapphire.
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Natural Rubies with Glass-Filled Cavities
Separating Glass-Filled Rubies Using the DiamondView
The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
Ruby and Sapphire from Muling, China
An emerging corundum deposit in northeastern China is discussed.
Ruby with Interesting Synthetic Overgrowth
Microscopic examination of a ruby at the Carlsbad laboratory reveals synthetic overgrowth indicative of high-temperature heat treatment.
A Canary in the Ruby Mine: Low-Temperature Heat Treatment Experiments on Burmese Ruby
Documents heating experiments conducted on Burmese rubies to find useful indicators of heat treatment at temperatures below 1200°C.
Extremely Rare Hellandite Inclusion Found in a Mogok Ruby
A rare inclusion is reported in ruby from the Mogok mine for the first time.
“Electromagnetic Wave” Inclusion in Mong Hsu Ruby
Fiber-optic illumination reveals an electromagnetic wave-like pattern of particles in a ruby from Myanmar.
Update from Mozambique’s Ruby Mines
A field gemology team from GIA provides an update on the ruby mining operations around Montepuez.
Extraterrestrial-Like Inclusion in Mozambique Ruby
A 3.03 ct stone submitted to GIA’s Bangkok laboratory was identified as a ruby from Mozambique with no indication of heating.
A Review of Analytical Methods Used in Geographic Origin Determination of Gemstones
Geographic origin determination relies on a combination of gemological observations and advanced analytical tools. This contribution reviews the analytical methods commonly used to establish origin.
A Quantitative Description of the Causes of Color in Corundum
Presents a quantitative means of determining the causes of color in a gem material, using corundum’s six major chromophores as an illustration.
Not All That Glitters is Gold — Sometimes it is Mozambican Rubies
Learn about Mozambican rubies, including their mining history, characteristics and market demand.
