Large Tridacna Shell with a Blister Pearl and a Shell Blister
A large shell submitted to the Mumbai laboratory exhibits both a blister pearl and a shell blister.
Neptunite Inclusions in Rare Poudretteite
The first recorded occurrence of neptunite inclusions in poudretteite.
Diffusion-Induced Blue Spinel-Like Layer on Natural Sapphire
Three natural sapphires exhibiting a surface layer of gahnite are studied at the GGTL laboratory.
Laboratory Growth of Gem Materials and the Attempt to Replicate Nature
Provides an overview of processes for synthesizing gem materials and explains how unique growth conditions enable them to be separated from naturally formed gems.
Clinochlore and Muscovite in Quartz from Colorado
Bluish green and white spheres create a beautiful inclusion scene in quartz from Larimer County, Colorado.
An “Eye” on a Tridacninae Pearl
A Tridacninae pearl exhibits a flame structure resembling an eye.
“Snail” in Diamond
While different types of inclusions often occur independently within diamond, it is quite rare to find more than one occurring simultaneously, let alone in contact with each other.
A New Deposit of Pink Natrolite from Indonesia
Lovely rose-pink natrolite from Indonesia is dubbed “rhodatrolite” for its color and texture.
Portrait of a Paraíba Rough: Challenging Gems in Hard Times
Many variables were involved in the sale and manufacture of a beautiful rough gem during difficult times.
Cat’s-Eye Andradite
Fine needle inclusions create a striking cat’s-eye effect in a rare brownish yellow andradite garnet.
Exceptional Purple Montana Sapphire
A particularly fine unheated purple Montana sapphire is noted for both its size and its multiple diverse inclusions.
Hemimorphite Resembling Paraíba Tourmaline
Copper in the zinc silicate known as hemimorphite creates an electric blue color similar to that of Paraíba tourmaline.
Irradiated Blue Diamond with Interesting DiamondView Image
DiamondView image of an irradiated blue diamond reveals unusual gemological features due to a combination of treatments.
HPHT Laboratory-Grown Pink Diamond with Unstable Color
A lab-grown diamond with an equivalent color grade to Fancy Vivid pink demonstrates a temporary color change under short-wave UV radiation.
Pink Mozambique Sapphire
Examination and testing of a beautiful large pink sapphire establishes its lack of treatment and its origin in Mozambique.
Rare Inclusion of Chabazite in a Precious Opal from Ethiopia
An inclusion rarely seen in a cut stone appears in a gray Ethiopian opal.
Trapiche-Like Pattern in an Emerald from Pakistan
Brightfield illumination reveals a distinctive growth pattern similar to trapiche in a beautiful emerald from Swat Valley.
Intergrown Emerald Specimen from Chivor
An emerald specimen from Chivor hosts a large, well-formed emerald inclusion.
Glass-Filled Polki-Cut CVD Synthetic Diamonds
India’s Gem Testing Laboratory (GJEPC) encounters glass-filled CVD synthetic diamond polkis for the first time.
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