Synthetic Moissanite with Fraudulent GIA Inscription
GIA Johannesburg identifies fraudulent GIA inscriptions on several synthetic moissanites submitted as diamonds.
A Near-Field-Communication (NFC) Technology Device Embedded in Bead Cultured Pearls
The Carlsbad laboratory received for examination two dark-colored bead cultured pearls embedded with an electronic device from Jeremy Shepherd, CEO of Pearl Paradise.
Quarterly Crystal: Ferrocolumbite in Topaz
“Star cruisers” formed of ferrocolumbite seem to fly in a large topaz crystal from the Shigar Valley in Pakistan.
Color-Change Cat’s-Eye Diaspore
A 60.71 ct cabochon was recently submitted to the Tokyo lab for identification.
Magnetite Inclusions in Star Peridot
Magnetite inclusions in a four-rayed star peridot help to date its terrestrial age.
Natural-Color D-to-Z Diamonds: A Crystal-Clear Perspective
Examines a very large dataset of colorless to near-colorless diamonds submitted to GIA and evaluates their diamond type and spectroscopic properties.
Historical Reading List: Lazurite (Lapis Lazuli) from Afghanistan and its Artistic Use as a Blue Pigment (Ultramarine)
Annotated reading lists compiled on Lazurite (Lapis Lazuli) from Afghanistan and its Artistic Use as a Blue Pigment (Ultramarine)
Multiple Radiation Stains Suggest Interesting Geological Residency
A rough diamond crystal weighing 4.05 ct was observed with radiation staining on its surface.
A Sapphire with a Negative Crystal Containing a Mobile Graphite Daughter Crystal
Mineral and fluid phases within negative crystals in metamorphic sapphires provide us with general information on the sapphire and the trapped fluid itself.
Hydrogen and Oxygen Stable Isotope Ratios of Dolomite-Related Nephrite: Relevance for Its Geographic Origin and Geological Significance
Examines the effectiveness of hydrogen and oxygen isotopes in discriminating dolomite-related nephrites from the four most important occurrences worldwide.
The “Fragility of the Eternal” Kunzite: Origin, Cutting, and Identification
A master gem carver bases his latest design off a stunning stained glass window when attempting the world’s largest known cut kunzite.