Forsterite in a Purple Tanzanian Spinel
Examination of a purple spinel from Tanzania reveals a rare forsterite inclusion.
Liberian Ruby
A trip to a rural Liberian diamond mining community results in a newly discovered source of corundum.
Luminescent Synthetic Garnet-Like Crystals
Unique rough and faceted luminescent synthetic garnet-like crystals were on display at the 22nd Street show in Tucson.
New Tourmaline Pockets in San Diego County’s Pala District
Bill and Carl Larson share details about new tourmaline pocket discoveries at the Tourmaline King mine.
New Find of Petroleum-Included Quartz from Madagascar
Examination of quartz from a new source in Madagascar reveals complex fluid inclusions consisting of petroleum, methane, asphaltite, and water.
Gemological Characterization of Montana Sapphire from the Secondary Deposits at Rock Creek, Missouri River, and Dry Cottonwood Creek
Examines the mining history and geological characteristics of the three secondary sapphire deposits in the state of Montana, as well as the properties of these sapphires (unheated and heat-treated).
Plastic Deformation: How and Why Are Most Diamonds Slightly Distorted?
A look at plastic deformation, one of the most prevalent features in natural diamond.
Microscopic Shells in Natural Pearls from Pinctada radiata
Two pearls from Bahrain containing minute shells are examined at GIA’s Mumbai laboratory.
Pinctada radiata Atypical Bead Cultured Pearls from the UAE
GIA’s Mumbai laboratory reports on pearl samples from a culturing experiment by the Suwaidi Pearl Farm in the UAE.
Exceptionally Rare Pearls from ECIJA
An impressive variety of natural, wild, nacreous, and non-nacreous pearls were on display at the GJX show.
Sixth Annual Gianmaria Buccellati Foundation Award Winner
A graduate of GIA’s Jewelry Design program in London is the recipient of the 2022 Gianmaria Buccellati Foundation Award.
YNY Jewels: Designer Surbhi Pandya
Handcrafted jewelry pieces featuring tanzanite carvings stood out at the GJX show.
Zeki Karaca Jewelry: Luxury Pens
One-of-a-kind bejeweled pens from Zeki Karaca caught the attention of attendees at the GJX show.
Ruby with Interesting Synthetic Overgrowth
Microscopic examination of a ruby at the Carlsbad laboratory reveals synthetic overgrowth indicative of high-temperature heat treatment.
“Atypical Beads”: Variations of Two Types of Nuclei
Four atypical bead cultured pearls with variations on two types of nuclei are examined in the Mumbai laboratory.
Morphology of Colombian Emerald: Some Less-Common Cases and Their Growth and Dissolution History
Evaluates the growth mechanisms of special morphological features in Colombian emerald, including possible relationships to trapiche emeralds and samples displaying the gota de aceite effect.
CVD Diamond Over 34 Carats Examined in GIA’s Hong Kong Laboratory
A look at the largest CVD diamond GIA has encountered to date.
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