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Rubies and sapphires from Didy in Madagascar were recently discovered by timber loggers in a remote jungle covered area in the North East of Madagascar. Some very fine, large and clean rubies and blue sapphires were produced from the new deposit.
Article
Ruby and Sapphire Rush Near Didy, Madagascar

An expedition to investigate this new deposit revealed that their morphology and gemological properties are reminiscent of blue sapphires from Mogok in Burma or Tunduru in Tanzania.

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Infrared mapping data of an HPHT-grown synthetic diamond wafer.
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Infrared Microscopy Applications

Explores the usefulness of this technique in the mapping of defects and spectral features, the determination of color origin, and the identification of synthetic and treated diamond melee.

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Article
Rubies from the Montepuez Area

In October 2013, GIA’s Bangkok laboratory produced a study of the samples collected during the September 2012 expedition.

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Heat treatment of some pink sapphires
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Low-Temperature Heat Treatment of Mozambique Ruby

Report on changes in Mozambique ruby following low-temperature heating, observed using inclusion analysis, FTIR spectroscopy, and LA-ICP-MS.

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Faceted Cobalt-Diffused Spinel and Polished Plate Samples
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GIA Lab Reports on a New Cobalt Diffusion Treatment of Natural Spinel

Report on a new cobalt diffusion treatment of natural spinel, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

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Blue Sapphire
Article
New Nigerian Source of Blue Sapphire

A preliminary report on blue sapphires from a new deposit in Nigeria's Mambilla Plateau.

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