Spiral Nacre in Natural Pearl
Nacreous pearls are known to have platelet growth resembling fingerprints or topographic maps, but a less common appearance is nacre with a concentric spiral pattern.
Monazite (?) in Quartz
Analysis of a transparent yellow angular crystal inclusion in a Brazilian rock crystal quartz host suggests monazite.
Chondrodite in Red Spinel from Mogok, Myanmar
Blue Zircon Reportedly from Malawi
A reported new source of blue zircon in Malawi yields rough material for beautiful finished stones in the gem trade.
Burmese Blue Sapphire and Peridot from Mogok and a History of Emerald Mining in Habachtal, Austria
Color-Zoned Cat’s-Eye Chrysoberyl
The Tokyo lab recently identified a unique localized distribution of cloud-like inclusions in a chrysoberyl.
Faceted Demantoid Garnet with Spectacular “Horsetail” Inclusions
Remarkable “horsetail” inclusions discovered in a demantoid garnet, while their origin and composition remain under discussion.
Rainbow Graining in Diamond
One of the more subtle inclusion scenes gemologists sometimes observe in natural diamonds is the presence of crystallographically oriented structural defects known as “internal graining.”
Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar
Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.
Blue Sapphires from Mogok, Myanmar: A Gemological Review
A gemological analysis of blue Burmese sapphires from Mogok, based on a series of field expeditions over the last decade.
History of Emerald Mining in the Habachtal Deposit of Austria, Part I
Contributes to the mining history of Austria’s Habachtal region, which is believed to be one of the earliest emerald deposits.
Star Rhodochrosite
The Carlsbad lab received a rhodochrosite cabochon featuring rhomboid-shaped fluid inclusions, causing a four-rayed star.
Two Antique Mughal Spectacles with Gemstone Lenses
Unique diamond- and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
Colored Stones from the Deep
The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
Banded Turquoise from Zhushan County, Hubei Province, China
Researchers examine six specimens of banded turquoise, obtained through long-term cooperation of local miners in Zhushan County.
CVD实验室培育钻石大小刷新世界纪录
GIA 任命 Richard Pesqueira（理查德·佩斯凯拉）为业务发展副总裁
加利福尼亚州卡尔斯巴德 – 12 月 16 日（星期四） – 作为宝石学研究、教育以及以科学为基础的宝石鉴定与分级服务领导者，GIA（美国宝石研究院）目前正在大力发展其卓越的服务体系和员工队伍，致力于向全球主要品牌和零售商提供创新产品。
GIA权威评级, 为挚爱守护一生 甄选一颗由GIA专家精心鉴定的钻石
加利福尼亚州卡尔斯巴德 – 2021 年 12 月 2 日 – 给人们的生活带来喜悦的钻石以及 GIA 的钻石分级专家报告所激发的信心是 GIA 十多年来首次全球消费者营销活动的核心。
GIA权威评级, 为挚爱守护一生 甄选一颗由GIA专家精心鉴定的钻石
加利福尼亚州卡尔斯巴德 – 2021 年 12 月 2 日 – 给人们的生活带来喜悦的钻石以及 GIA 的钻石分级专家报告所激发的信心是 GIA 十多年来首次全球消费者营销活动的核心。
GIA Board Meets to Set Priorities; Welcomes New Governors
CARLSBAD, Calif. – Nov. 17, 2021 – The GIA Board of Governors held their first in-person meeting in two years, Nov. 5 – 8, in Carlsbad, California.
.jpg "YMAL GIA Ed")
