Near-Colorless HPHT Synthetic Diamonds from AOTC Group
Presents the gemological 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.
Update on Ammolite Production from Southern Alberta, Canada
There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.
Characterization 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.
Liddicoatite Tourmaline from Anjanabonoina, Madagascar
Liddicoatite, a calcium-rich lithium tourmaline, was recognized as a separate mineral species in 1977, and named in honor of Richard T. Liddicoat.
Characterization of Tarnish Spots in Chinese High-Purity Gold Jewelry
Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided.
Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color
An investigation of the difference between synthetic opal and opal simulant.
Technological Development in the 1990s: Their Impact on Gemology
In the last decade, technology has improved how we synthesize, process, identify, and otherwise study gem materials.
Separating Natural and Synthetic Rubies on the Basis of Trace-Element Chemistry
Natural and synthetic gem rubies can be separated on the basis of their trace-element chemistry.
Gemological Properties of Near-Colorless Synthetic Diamonds
Examination of 51 colorless to near-colorless synthetic diamonds from all known sources of production confirms that they can be distinguished from similar-appearing natural diamonds on the basis of their gemological properties.