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Sapphire
The name “sapphire” can also apply to any corundum that’s not ruby red, another corundum variety.
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Tourmaline and Sapphire from Nigeria
An update on Nigerian colored stone production is obtained at the Tucson gem shows.
Pink Sapphire Filled with Bismuth-Based Glass
A sapphire with a color not commonly seen in the lab is found to have a glass filling.
Multi-Elemental Diffused and Melt-Grown Synthetic Sapphire
GIA examines a multi-elemental diffused and melt-grown synthetic sapphire for the first time.
Ethical and Sustainable Vertical Integration in the Sapphire Market
The recession of 2008 transforms a gem business into a vertically integrated operation.
The Role of Silicon in the Color of Gem Corundum
Considers the previously unreported but critical impact of silicon on the coloration of gem-quality sapphire.
A Study of Sapphire from Chanthaburi, Thailand and its Gemological Characteristics
A report from the GIA Laboratory in Bangkok presents their findings on 59 blue sapphire samples obtained from a miner in the Khao Ploy Waen area, Chanthaburi.
An In-Depth Gemological Study of Blue Sapphires from the Baw Mar Mine (Mogok, Myanmar)
GIA field gemologists visited Baw Mar operations in 2013, 2014, and 2015. In this study, we analyzed samples collected during two separate expeditions.
Sapphires from the Gem Rush Bemainty area, Ambatondrazaka (Madagascar)
The discovery of many fine quality sapphires in this area is opening a new chapter in the conflict between conservation and gem mining in northeastern Madagascar.
Update on Spectroscopy of “Gold Sheen” Sapphires
The chemical composition and spectroscopic characteristics of 14 gold sheen sapphires are examined.
Trapiche-Type Sapphire from Tasmania
A rare Tasmanian trapiche-type sapphire, found during a field expedition, is examined.
Synthetic Sapphire and Synthetic Spinel Doublets
Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.
Gem Fossicking: Recreational Mining in Australia
Fossicking is a special type of mining activity that Australians love. Australia is a large country rich in many types of gem resources. Come to Australia with the GIA field gemology team to feel the passion of gem fossicking in the southern hemisphere.
