消费者想知道其珠宝的各组件——宝石、钻石和贵重金属是否源自责任采购。

了解天然钻石和实验室制造钻石之间的差异和相似之处，以及 GIA 研究人员和分级鉴定所如何讲述这些差异。

加利福尼亚州卡尔斯巴德 — 2019 年 5 月 30 日 — 5 月 24 日，GIA 钻石原产地证书服务新增天然彩色钻石。

星期五, 五月 31, 2019 12:00 – 13:30 JCK 拉斯维加斯珠宝展 金沙会展中心 201 金沙大道 拉斯维加斯，内华达州 89169 1 楼 303 和 304 室

由于全球其他地区的业务放缓，业界所有目光都集中在拉斯维加。

达碧兹祖母绿拥有独特的六幅车轮图案，是所出产的晶体中最精致、最与众不同的宝石之一，堪称宝石界的标杆。

An overview of the Spring 2019 Gems & Gemology content.

The age of something is fundamental. Humans, animals, wine, cars, and antiques are viewed and understood in the context of their age.

A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.

The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.

Bangles resembling nephrite and jadeite were not what they appeared to be.

Advanced testing helps to identify the largest gahnospinel seen at any GIA laboratory.

Spinel is often inclusion free but occasionally showcases unusual inclusions.

Indonesian purple chalcedony containing interesting native copper inclusions is a first for the Carlsbad lab.

Trapiche-like ruby from Kashmir shows a well-formed fixed six-rayed pattern.

Investigates trace-element chemistry of freshwater natural pearls from North America and China with LA-ICP-MS and uses LDA to identify their origins.

Presents a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement of six common major elements.

Establishes a metamorphic origin for sapphire samples from these deposits, supported by their trace-element composition and inclusion characterization, including the age dating of zircon inclusions.

Documents a visit to the sapphire, opal, and emerald mining and trading areas of Ethiopia.