Rare pearls, along with their shell, are studied in the Hong Kong lab.

A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.

Over the last decade, the production methods used to create synthetic diamond melee have improved substantially, along with the quality of the specimens themselves.

Crassostrea virginica, the so-called Eastern or American oyster, is a commercial seafood widely distributed along the east coast of the United States to the Gulf of Mexico.

A sapphire cabochon with an unusual appearance is seen at GIA’s Tokyo lab.

A Medusa quartz from Paraíba, Brazil, hosts a surprising inclusion.

A diamond examined in the Carlsbad lab shows chameleon coloring in an unusual pattern.

For the first time, wurtzite is found as an inclusion in gem material.

Aesthetically pleasing inclusions are found in topaz from Pakistan’s Shigar Valley.

Lotus Gemology receives submissions of star stones on a regular basis, so when we first saw the specimen shown here, it appeared to be one among many of our usual stones to test.

A black star sapphire produced from eastern Thailand, showing both golden and silver rays, is studied at GIA’s Bangkok lab.

Seldom-seen inclusions are found in a host material that is rare in its own right.

A yellowish green specimen with horsetail-like inclusions is found to be glass rather than demantoid garnet.

“有色宝石（非钻石）的价值要素、设计和切工品质”系列的第 5 部分（共 5 部分）探索了工艺对切工品质的影响。

本系列第 4 部分（共 5 部分）：有色宝石（非钻石）的价值因素、设计和切工品质。本文深入分析了切磨师的各种选择，并探讨了业内用于评估相对价值的其他因素。

本系列第 3 部分（共 5 部分）：有色宝石（非钻石）的价值因素、设计和切工品质。本文将探讨切磨决策如何对宝石的颜色品质产生深远的影响。

在这篇综合性文章中，作者分五部分探讨了有色宝石的价值要素。第一部分和第二部分发布于《宝石市场新闻》2016 年 1/2 月刊第 1 期第 35 卷；第三部分和第四部分发布于 2016 年 3/4 月刊第 2 期第 35 卷；第五部分发布于 2016 年 5/6 月刊第 3 期第 35 卷。请注意，原文没有在标题中使用术语“刻面”。但是，本系列的主旨即是刻面宝石。

A look at the color zoning exhibited by the largest HPHT-treated blue diamond graded by GIA.

A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.