Research Article Search Results
Acicular Troughs Coincident with Green Stains on Rough Diamond Surface
The author acquired an alluvial rough diamond from Guyana showing unique surficial features that do not appear to have been documented elsewhere.
Deep-Focus Earthquakes: The Heartbeat of a Diamond Factory?
The first installment of this column explores the potential role of modern-day deep-focus earthquakes on diamond growth.
Radioactive Green Diamond
Spiral Nacre in Natural Pearl
Nacreous pearls are known to have platelet growth resembling fingerprints or topographic maps, but a less common appearance is nacre with a concentric spiral pattern.
Monazite (?) in Quartz
Analysis of a transparent yellow angular crystal inclusion in a Brazilian rock crystal quartz host suggests monazite.
Chondrodite in Red Spinel from Mogok, Myanmar
Blue Zircon Reportedly from Malawi
A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
Burmese Blue Sapphire and Peridot from Mogok and a History of Emerald Mining in Habachtal, Austria
Color-Zoned Cat’s-Eye Chrysoberyl
The Tokyo lab recently identified a unique localized distribution of cloud-like inclusions in a chrysoberyl.
Faceted Demantoid Garnet with Spectacular “Horsetail” Inclusions
Remarkable “horsetail” inclusions discovered in a demantoid garnet, while their origin and composition remain under discussion.
Rainbow Graining in Diamond
One of the more subtle inclusion scenes gemologists sometimes observe in natural diamonds is the presence of crystallographically oriented structural defects known as “internal graining.”
Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar
Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.
