Dual-Color Double Stars in Ruby, Sapphire, and Quartz: Cause and Historical Account
Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.
Turquoise with Fingerprint Pattern
A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.
Microscopic Observations of Blue Sapphires Treated with Heat and Pressure
A previously unreported microscopic feature could be a useful indicator for corundum treated with heat and pressure.
Emeralds Filled with Epoxy Resin: DiamondView Observations
“Blue flashes” seen with the DiamondView help to analyze the quantity and variety of emerald-filling substances.
Coated Pink Synthetic Moissanite
A pink synthetic moissanite is coated with a thin colored film, raising questions about the natural origin of its color.
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits
Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.
Classifying Emerald Clarity Enhancement at the GIA Gem Trade Laboratory
One of the greatest concerns with emerald filling is the degree of clarity enhancement such treatment represents
An Introduction to Gem Treatments
A guide describing frequently encountered gem treatment processes, their detection, and special care tips for treated gems.
Gemstone Enhancement and its Detection in the 2000s
Advances in technology and increased demand for lower-priced gem materials contributed to the proliferation of new treatments throughout the first decade of the 2000s.
Abstracts; Fall 2006
This article, from the Fall 2006 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.