Colombian Emerald Industry: The New Generation
Luis Gabriel Angarita and Edwin Molina share their experiences and perspective on the Colombian emerald industry.
Turquoise from Western Arkansas
A report on turquoise from the only known U.S. deposit outside of the Southwest.
Irradiated and Annealed Blue Type Ia Diamond
Examination shows that a diamond was subjected to a multi-step process in order to introduce a blue color.
Unheated and Unusual Colors
Margit Thorndal of Madagascar Imports offers her perspective on the colored stone market.
Filled Pearl with Surface Features
A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.
Update on Dyed Hydrophane Opal
Opal purportedly from a new deposit is found to be dyed.
Coated Beryl Imitating Emerald
Coating on a beryl demonstrates the importance of thorough examination of jewelry and gem materials.
Chalcedony Beads Coated With Titanium Nitride
Beads in an necklace show a metallic appearance not seen in chalcedony.
Update on Rock Creek Sapphire Deposit
An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.
Durability of a Broken Glass-Filled Ruby
Heat treatment and glass filler are discovered in a ruby after it is broken during the jewelry setting process.