Near-Colourless HPHT Synthetic Diamonds from AOTC Group
Presents the gemmological and spectroscopic properties of a suite of synthetic diamonds grown by AOTC using high pressure and high temperature.
The Separation of Natural from Synthetic Colourless Sapphire
Greater amounts of colourless sapphire—promoted primarily as diamond substitutes, but also as natural gemstones—have been seen in the gem market during the past decade.
Some Diagnostic Features of Russian Hydrothermal Synthetic Rubies and Sapphires
Most Russian hydrothermal synthetic rubies and pink, orange, green, blue and violet sapphires—coloured by chromium and/or nickel—reveal diagnostic zigzag or mosaic-like growth structures associated with colour zoning.
Tairus Hydrothermal Synthetic Sapphires Doped with Nickel and Chromium
Researchers from the Tairus joint venture have developed the technology for the hydrothermal growth of gem-quality crystals of synthetic sapphire.
“Ti-Sapphire”: Czochralski-Pulled Synthetic Pink Sapphire from Union Carbide
One of the most interesting of the commercially available Czochralski pulled synthetic corundums is pink “Ti-sapphire.”
A Preliminary Report on the New Lechleitner Synthetic Ruby and Synthetic Blue Sapphire
A new synthetic ruby and synthetic blue sapphire have been synthesised by Johann Lechleitner of Innsbruck, Austria.
This article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
The Gemmological Properties of Chatham Flux-Grown Synthetic Orange Sapphire and Synthetic Blue Sapphire
The author examines the gemmological properties of Chatham flux-grown synthetic orange sapphires and blue sapphires.
Abstracts; Summer 2009
This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.