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。
Book Review: The Secret Teachings of Gemcutting: 50 Classic Gemstone Designs
Review of The Secret Teachings of Gemcutting: 50 Classic Gemstone Designs, by Justin K. Prim.
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.
HPHT-Processed Diamond with Counterfeit GIA Inscription
Careful comparison of two GIA reports reveals a fraudulent inscription on a laboratory-produced diamond presented as a natural.
Internal Structures of Known Pinctada maxima Pearls: Cultured Pearls from Operated Marine Mollusks
A selection of 74 non-bead cultured and 12 bead cultured pearls grown in cultured pearl sacs and harvested directly from operated mollusks were collected and their internal structures examined using real-time microradiography and X-ray computed microtomography analyses.
Laboratory-Grown Diamond with Internal Laser Markings
Accidental laser damage likely caused unusual internal spiral markings in a 2.44 ct CVD-grown diamond.
Zircon with Unusual Color-Change Behavior
The Carlsbad laboratory recently had the chance to examine a 4.60 ct cushion-cut zircon with truly unusual color behavior.
Faceted Octahedral Diamond with Octahedral-Shaped Inclusion
Creative faceting highlights an octahedral-shaped cloud inclusion in a 2.01 ct diamond octahedron.
New CVD Material Submitted for Analysis (英语)
A group of large, high-quality CVD material demonstrates the continued challenge of identifying laboratory-grown gems.
Fossilized Shell Consisting of Emerald
Several shells received at the Hong Kong laboratory were identified as fossils replaced by emerald crystals.
FTIR Observation on Sapphires Treated with Heat and Pressure
A study on heat with pressure treatment of blue sapphires reveals FTIR patterns associated with different iron concentrations.
Fura Gems’ Inaugural Ruby Sale
Fura Gems hosted its first sales event for rough Mozambican rubies in August and September 2021.
Heat Treatment Effects on the Behavior of the 3161 cm–1 Feature in Low-Iron Metamorphic Yellow Sapphire
This study examines FTIR spectra of yellow sapphire heat treated in an oxidizing atmosphere to deepen its color.
James Shigley Receives Robert M. Shipley Award
Distinguished research fellow Dr. James Shigley receives the Robert M. Shipley Award for his contribution to the science of gemology.
Spectroscopic Characteristics of Low-Temperature Heated Blue to Violet Spinel
Although spinel is rarely treated, there have been some heated spinels available in the trade.
Glass Imitation of Star Sapphire
A fixed star indicating manufactured asterism helps to identify an imitation star sapphire.
Hematite “Rose” Inclusion in Aquamarine
Recently, a 23.67 ct pear cabochon aquamarine with light greenish blue color and poor clarity was sent to the Taiwan Union Lab of Gem Research (TULAB) for identification.
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