Jonathan Muyal Named Gem-A's Photographer of the Year
Carlsbad-based G&G contributor takes top honors in Gem-A's annual photography competition.
Cape Diamond with Yellow Phosphorescence
Paraíba Tourmaline with Unusual Coating
A coated Paraíba tourmaline is seen for the first time at a GIA lab.
Rubellite with Incredibly Strong “Pink Sleeves”
Radiation-induced pink sleeves are seen in a rubellite cabochon.
Color Origin of Phenakites from the Ural Emerald Mines
An investigation into jewelry-grade phenakite from Russia.
Fourth International Diamond School
A report from the fourth International Diamond School, held in January 2018 in Brixen-Bressanone, Italy.
Universal Microscope Upgrade Kit
A review of an upgrade kit that maximizes the use of a gemological microscope.
Filled Calcite with Pronounced Phosphorescence
A sphere with a greasy luster exhibiting strong phosphorescence is investigated.
Mixed-Type Treated Red HPHT Synthetic Diamond
A fancy-color treated synthetic specimen is revealed to be IaA + IaB + Ib types.
Condor Agate from Argentina
A vibrant orange and yellow agate displays interesting concretions in its core.
“Double Bubble” Multiphase Inclusion in Beryl
Grandidierite Inclusions in Sapphires
Grandidierite, an unusual inclusion in sapphire, independently encountered by two laboratories.
Quarterly Crystal: Orpiment in Barite
Sapphire Inclusion with Rutile “Silk” in a Burmese Star Sapphire
Illumination techniques reveal a remarkable sapphire inclusion within a Burmese star sapphire.
Star-Like Growth in Natural Yellow Sapphire
A natural yellow sapphire features a distinctive star-like graining pattern.
Jewelry Glossary Project Survey
Moonstone Jewelry
The adularescent gem moonstone was prominently featured in this year’s Tucson shows.
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