Large Colorless HPHT-Grown Synthetic Gem Diamonds from New Diamond Technology, Russia (英语)
Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.
Letseng’s Unique Diamond Proposition
Explores the history, geology, and current production of this unique source of large diamonds.
Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation (英语)
Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
Origin Determination of Dolomite-Related White Nephrite through IB-LDA
A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.
Books: Mineral Treasures of the Ozarks (英语)
Review of Mineral Treasures of the Ozarks, by Bruce L. Stinchcomb.
Books: Bright Lights in the Dark Ages: The Thaw Collection of Early Medieval Ornaments
书评：《Bright Lights in the Dark Ages: The Thaw Collection of Early Medieval Ornaments》（黑暗时代的亮光: 思奥藏品中的中世纪早期装饰品），作者：Noël Adams（诺尔·亚当斯）
Books: Maker & Muse: Women and Early Twentieth Century Art Jewelry
Review of Maker & Muse, Women of the 20th Century Art Jewelry, by Elyse Zorn Karlin.
Molybdenite in Topaz
Irradiated Green-Blue CVD Synthetic Diamonds (英语)
Advancing CVD growth technologies yield intensely colored, high-quality synthetic diamonds, such as the two green-blue synthetic materials seen in the New York lab.
Serpentine Cabochon with Unusual Olive Green Color
Assembled Cultured Blister Pearl with an Unusual Component
An assembled mabe pearl contains a fluted object, the function of which is unknown.
Modified Rheinberg Illumination
A lighting method modified for gemological microscopy provides false-color contrast to enhance inclusion scenes.
Cleavage System in Pink Diamond
A Fancy Intense purplish pink diamond with a network of planar cracks and strain-induced bodycolor reveals an aesthetic geometric pattern.
Pezzottaite Debuts as the Newest Trapiche Gem Mineral (英语)
A rare mineral acquired along the Thai-Myanmar border exhibits the distinctive six-spoke pattern associated with trapiche.
Large Star Emerald
An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.
Thai-Myanmar Petrified Woods
The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.
Unusual Graining Structure in Pink Diamond
A Very Light pink diamond showing a uniform plane of color intersecting with a cone of strain that fit perfectly into a colorless hole is studied at the Carlsbad lab.
Blue Gahnite Inclusions inCat’s-Eye Heliodor
Blue octahedral crystal inclusions within heliodor cabochons are found to be gahnite, a zinc-rich end member of the spinel group.
Rare “Star and Cross” Quartz from Brazil
Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.
Three Unique Large Natural Pearls from Haliotis (Abalone) Species
Abalone pearls submitted to the New York lab provide insight into the range of colors and shapes this type of mollusk can produce.
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