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.
“Jedi” Spinels in Mogok
Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.
Characterisation of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy
A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.
Update on Ammolite Production from Southern Alberta, Canada
There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.
A Look Inside a Remarkably Large Beaded South Sea Cultured Pearl
A study of the nacre and the cavity of a large Pinctada maxima cultured pearl yields a theory on the specimen’s formation.
Liddicoatite Tourmaline from Anjanabonoina, Madagascar
Liddicoatite, a calcium-rich lithium tourmaline, was recognised as a separate mineral species in 1977, and named in honour of Richard T. Liddicoat.
Gemesis Laboratory-Created Diamonds
High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemmological properties are explicated.
GE POL Diamonds: Before and After
This article explores and identifies the changes that type IIa GE POL diamonds experience before and after HPHT annealing.
Copper and tenorite inclusions in cuprian-elbaite tourmaline from Paraíba, Brazil
Inclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.
De Beers near Colourless-to-Blue Experimental Gem-Quality Synthetic Diamonds
De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.