Gemstones of Pakistan: Emerald, Ruby, and Spinel
This article reports on three gem materials currently being mined in Pakistan.
Fall 2009 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.
A History of Diamonds through Philately: The Frank Friedman Collection
South African jeweler Frank Friedman’s collection of diamond-themed stamps and other postal material offers an illuminating visual record of diamond history.
Exceptional Natural-Color Fancy Red Diamond
An extremely rare natural-color red diamond is submitted to the Carlsbad laboratory.
Gota de Aceite–Like Effect in a Brazilian Emerald
GIA’s Tokyo laboratory examines a Brazilian emerald with a gota de aceite–like effect characteristic of Colombian emeralds.
Rare Kashmir Star Sapphire
A stunning large Kashmir star sapphire, set in a combination ring and pendant, is submitted to the New York laboratory.
A Synthetic Moissanite Presented as Natural Diamond Rough
The New York laboratory identifies a sample submitted for a colored diamond identification and origin report as synthetic moissanite.
Barite-Calcite Composite as Imitation “Wulanhua” Turquoise from Hubei Province, China
“Wulanhua” turquoise bracelet identified as composite material made of barite, calcite, and blue dye.
Characteristics of Amber with Irradiation Treatment
A study of the effects of irradiation treatment on amber.
The Discovery of Davemaoite, the CaSiO3 Perovskite, in a Diamond from Earth’s Lower Mantle
Davemaoite identified in a diamond from Orapa, Botswana.
Gray “Spinel Sisters”
Two rare gray spinel stones stand out at the AGTA show for their exceptional size, quality, and color.
Inclusions and Spectroscopic Features of Yellowish Green Enstatite
Close study of six bright yellowish green enstatite samples reveals cause of color and four-rayed asterism.
Many Faces of Wavellite
An Arkansas lapidarist shares his work with wavellite and explains his stabilization process.
Old Techniques Reimagined: Maki-e Pearls
An ancient Japanese lacquer technique applied to cultured pearls creates unique pieces of art.
Hydrothermal Synthetic Ruby
A transparent cushion-cut hydrothermal synthetic ruby was recently submitted to Carlsbad laboratory for an identification report.
Nail-Head Spicule in a Russian Emerald
The Carlsbad laboratory observes a nail-head spicule in a natural Russian emerald.
Unusual Laser Drill Holes in a Laboratory-Grown Diamond
Unusual laser drill holes identified in a laboratory-grown Fancy yellow cushion modified brilliant diamond.
Bead Cultured Abalone Pearls from Chile
A study of abalone bead cultured pearls from a new pearl culturing technique tested in Chile.
Chromophore Behaviors (Including the 880 nm Absorption Band) in an Irradiated Pink Sapphire
A report showing the preliminary results of a radiation experiment with pink sapphire from Madagascar.
Update on Inclusions in Emeralds from Davdar, China
Testing reveals interesting inclusions in Chinese emeralds to be calcite and dolomite.
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