Garnet with Apatite Inclusions
Vibrant blue apatite inclusions are observed in a garnet sample from an undisclosed source in Africa.
Artisanal Diamond Mining: Addressing the Knowledge Gap
Diamonds for Peace conducts basic training on rough diamond grading for artisanal miners in Liberia.
Demantoid, Andradite, and Grossular from Mexico
A look at new gem material from the iridescent andradite deposit in Sonora, Mexico.
Pyritized Triceratops Fossils from South Dakota
A newfound dinosaur site in the Hell Creek Formation of South Dakota leads to the discovery of pyritized triceratops fossils.
“Kaleidoscope” in Alexandrite
Pleochroic colors caused by cyclic twinning produce a kaleidoscope effect in alexandrite.
Pseudo-Icosahedral Pyrite in Colombian Emerald
A 2.88 ct Colombian emerald plays host to a metallic yellow pyrite crystal.
Yellow Radiation Halos in Iolite (Cordierite)
Zircon, monazite, and apatite inclusions surrounded by yellow halos are observed in an iolite cabochon.
Rock Crystal with Cross Inclusion Exhibiting Brownian Motion
Numerous two-phase inclusions form a cross in a rock crystal pendant.
Spiky Inclusion in Padparadscha Sapphire
An inclusion with a metallic luster is observed in a pinkish orange padparadscha sapphire.
Irradiated Blue Diamond with Interesting DiamondView Image
DiamondView image of an irradiated blue diamond reveals unusual gemological features due to a combination of treatments.
10 ct HPHT-Treated CVD Laboratory-Grown Diamond
Testing a 10 ct CVD laboratory-grown diamond reveals evidence of HPHT treatment.
Interesting Set of Blue “Rough” Gemstones
Four blue rough gemstones are submitted as natural sapphire, but the Carlsbad laboratory determines only one is natural.
RFID Device Embedded in South Sea Bead Cultured Pearl Necklaces
The Bangkok laboratory reports an increasing number of RFID devices embedded in pearls, including two recently submitted South Sea bead cultured pearl necklaces.
Clinochlore and Muscovite in Quartz from Colorado
Bluish green and white spheres create a beautiful inclusion scene in quartz from Larimer County, Colorado.
Determining Garnet Composition from Magnetic Susceptibility and Other Properties
Quantitative measurements of magnetic susceptibility combined with RI or SG data can provide an easy and inexpensive way of inferring garnet composition.
Winter 2011 Gem News International
A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.
Spectral Analysis of Resin Imitation Ivory
Spectroscopic techniques prove key in separating resin-based imitation ivory from natural ivory.
Unusual Faceted Massive Fuchsite
An unusually large faceted fuchsite, the chromian variety of muscovite, was identified and its green color explained.
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