Research Article Search Results
Chondrodite in Red Spinel from Mogok, Myanmar
The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
Radioactive Green Diamond
The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
James Shigley Receives Robert M. Shipley Award
Distinguished research fellow Dr. James Shigley receives the Robert M. Shipley Award for his contribution to the science of gemology.
Spectroscopic Characteristics of Low-Temperature Heated Blue to Violet Spinel
Although spinel is rarely treated, there have been some heated spinels available in the trade.
Hematite “Rose” Inclusion in Aquamarine
Recently, a 23.67 ct pear cabochon aquamarine with light greenish blue color and poor clarity was sent to the Taiwan Union Lab of Gem Research (TULAB) for identification.
FTIR Observation on Sapphires Treated with Heat and Pressure
A study on heat with pressure treatment of blue sapphires reveals FTIR patterns associated with different iron concentrations.
Willemite in Topaz
A colorless topaz from Nigeria hosts the only known example of willemite as an inclusion in topaz.
A Unique Double Cat’s-Eye Emerald
The Tokyo lab examined a stunning double cat’s-eye emerald whose chatoyancy was created both by its cut and its inclusions.
New CVD Material Submitted for Analysis
A group of large, high-quality CVD material demonstrates the continued challenge of identifying laboratory-grown gems.
Faceted Octahedral Diamond with Octahedral-Shaped Inclusion
Creative faceting highlights an octahedral-shaped cloud inclusion in a 2.01 ct diamond octahedron.
HPHT-Processed Diamond with Counterfeit GIA Inscription
Careful comparison of two GIA reports reveals a fraudulent inscription on a laboratory-produced diamond presented as a natural.
Internal Structures of Known Pinctada maxima Pearls: Cultured Pearls from Operated Marine Mollusks
A selection of 74 non-bead cultured and 12 bead cultured pearls grown in cultured pearl sacs and harvested directly from operated mollusks were collected and their internal structures examined using real-time microradiography and X-ray computed microtomography analyses.
