Rough Diamond Fragment with a Large Green Cleavage Surface
A colorless diamond crystal fragment shows an eye-visible bluish green internal induced radiation stain that developed in a near-surface environment.
Impregnated and Dyed Turquoise
Natural turquoise has been subjected to dyeing and three types of impregnation.
A Jadeite Bangle Simulant: Hydrogrossular Garnet
Bangles submitted for identification are found to be not jadeite jade, but hydrogrossular garnet, an unusual choice for this form.
Large Star Emerald
An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.
Rare “Star and Cross” Quartz from Brazil
Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.
Serpentine Cabochon with Unusual Olive Green Color
A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.
Thai-Myanmar Petrified Woods
The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.
Assembled Cultured Blister Pearl with an Unusual Component
An assembled mabe pearl contains a fluted object, the function of which is unknown.
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.
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.
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.
Letseng’s Unique Diamond Proposition
Explores the history, geology, and current production of this unique source of large diamonds.
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.
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: Maker & Muse: Women and Early Twentieth Century Art Jewelry
Review of Maker & Muse, Women of the 20th Century Art Jewelry, by Elyse Zorn Karlin.
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: Cycles of Life: Rings from the Benjamin Zucker Family Collection
Review of Cycles of Life: Rings from the Benjamin Zucker Family Collection, by Sandra Hindman, with Beatriz Chadour-Sampson, Reine Hadjadj, Jack Ogden, and Diana Scarisbrick.
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