Fine needle inclusions create a striking cat’s-eye effect in a rare brownish yellow andradite garnet.

A lab-grown diamond with an equivalent color grade to Fancy Vivid pink demonstrates a temporary color change under short-wave UV radiation.

An inclusion rarely seen in a cut stone appears in a gray Ethiopian opal.

Brightfield illumination reveals a distinctive growth pattern similar to trapiche in a beautiful emerald from Swat Valley.

An emerald specimen from Chivor hosts a large, well-formed emerald inclusion.

India’s Gem Testing Laboratory (GJEPC) encounters glass-filled CVD synthetic diamond polkis for the first time.

Regular G&G contributor receives award for his work in the field of gemology.

Gemological and trace element chemical characteristics of ornamental jadeites from the Levoketchpel deposit in Russia are compared with other sources.

A study on American ruby and sapphire from Rock Creek, Montana, unveils a few geochemical mysteries.

The Carlsbad laboratory encounters a unique spessartine garnet that displays a strong color change from dark green to dark red.

Advanced testing confirms dyed material as serpentine, rather than the sugilite it was meant to imitate.

A light yellow 2.07 ct oval brilliant is the first faceted milarite examined by the Carlsbad laboratory.

Flux-grown pink synthetic sapphire displays a natural-looking inclusion scene.

Careful examination by the Carlsbad laboratory identifies both coating and clarity enhancement of an aquamarine pendant.

GIA’s laboratories are now using LA-ICP-MS to separate kornerupine from prismatine based on boron concentrations.

Recently, the Carlsbad laboratory identified a 19.68 ct gray-purple spurrite with the help of advanced testing.

This article describes a new manufactured gem material marketed under the trade name

“Photoatlas of Inclusions in Gemstones”; “Pearls: Natural, Cultured and Imitation”

Considerable confusion exists in the trade about the important differences between trademarks and patents.