Trapiche and More...
Colombia’s unique trapiche emeralds exert a fascination for many gemologists.
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.
Dumortierite-Quartz Rock Presented as Sapphire
The Gem Testing Laboratory of Jaipur, India, received for identification an opaque blue specimen, submitted as sapphire.
Undisclosed Samples of Large CVD Synthetic Diamond
In mid-2012, one of the international diamond grading laboratories in Antwerp reported undisclosed CVD synthetic diamonds, causing a stir in the diamond industry.
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.
Copper and Tenorite Inclusions in Cuprian-Elbaite Tourmaline from Paraíba, Brazil
Inclusions of native copper and tenorite (CuO) were found in grayish green elbaite from São José da Batalha, Paraíba, Brazil.
Majorica Imitation Pearls
The Majorica S.A. product is remarkably similar in appearance to saltwater cultured pearls.
Mildly Radioactive Rhinestones and Synthetic Spinel-And-Glass Triplets | Gems & Gemology
Low levels of radioactivity were found in some greenish yellow to yellow-green (peridot-like) synthetic spinel-and-glass triplets, mirror-backed glass rhinestone chatons, and fully fashioned glass rhinestones.