Vanadium and Chromium-Bearing Pink Pyrope Garnet: Characterization and Quantitative Colorimetric Analysis
This type of pink pyrope garnet, believed to have been mined in Tanzania, shows a distinct color-change phenomenon resulting from its unique chemical composition.
Characterization of Tarnish Spots in Chinese High-Purity Gold Jewelry
Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided.
The Grand Sapphire of Louis XIV and The Ruspoli Sapphire
Archival research and gemological characterization reveal the true story of this 135.74 ct blue sapphire from the French crown jewels.
The Origin of Montana’s Alluvial Sapphires
Microscopic and chemical analysis may provide clues to the original source of Montana’s alluvial sapphires and help distinguish them from sapphires with overlapping properties.
璀璨内陆：探秘澳大利亚的蛋白石矿场 (英语)
Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.
Book Review: Collector’s Guide to Herkimer Diamonds
书评：Collector’s Guide to Herkimer Diamonds（《赫基默钻石收藏家指南》），作者：Michael R. Walter（迈克尔·R·瓦尔特）。
Two Large CVD-Grown Synthetic Diamonds Tested by GIA (英语)
Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.
Large Natural Fossil Blister Pearls from Tridacna (Giant Clam) Species
Two blister pearls attached to a host shell believed to have fossilized during the later Pleistocene period and discovered in southeastern Kenya are studied.
Grandidierite from Madagascar
An unfamiliar rough fragment acquired from Madagascar may point toward a new source of grandidierite.
Garnets, Sapphires, Opals, and Tarnish on High-Purity Gold
马达加斯加 Zahamena 国家公园的一个新矿床出产的红宝石 (英语)
A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.
Demantoid Garnet with Giant Fluid Inclusion
34th International Gemmological Conference
A report from the 34th IGC, held in Vilnius, Lithuania in August 2015.
A New Natural-Color Bluish Green Chalcedony
A new type of African chalcedony with the trade name “Aquaprase” shows unique composition and attractive color.
Stars Are Out in Paraíba Tourmaline
Rare material from Brazil features four-ray stars under point-source light.
石墨内含物形成钻石的八面体轮廓 (英语)
An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.
A Natural Pearl with an Intriguing Internal Structure
A semi-baroque pearl with an unusual radial feature is submitted to the Bangkok lab for testing.
Two Large Natural Pearls Reportedly from Spondylus and Trochoidea Species Mollusks
Natural pearls of unusual size and unique appearance are retrieved from the west coast of Mexico and examined in GIA’s New York lab.
Winter 2015 G&G Publication Information
This document provides the publication information for Gems & Gemology
.jpg "YMAL GIA Ed")
