An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.

The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.

Blue octahedral crystal inclusions within heliodor cabochons are found to be gahnite, a zinc-rich end member of the spinel group.

Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.

Abalone pearls submitted to the New York lab provide insight into the range of colors and shapes this type of mollusk can produce.

Natural turquoise has been subjected to dyeing and three types of impregnation.

A colorless diamond crystal fragment shows an eye-visible bluish green internal induced radiation stain that developed in a near-surface environment.

A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.

Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.

A Very Light pink diamond showing a uniform plane of color intersecting with a cone of strain that fit perfectly into a colorless hole is studied at the Carlsbad lab.

Review of Treasures from India: Jewels from the Al-Thani Collection by Navina Najat Haidar and Courtney Ann Stewart.

跟随 GIA 的实地宝石学家走访马达加斯加、肯尼亚、坦桑尼亚、赞比亚和莫桑比克的宝石采矿区。

《宝石与宝石学》(Gems & Gemology, G&G) 简报介绍了《宝石与宝石学》(Gems & Gemology) 2015 年秋季刊的内容概要。

在 GIA 实地宝石学家 Vincent Pardieu（文森特·珀杜）和 Aaron Palke（亚伦·保克）博士勘探摩谷红宝石、蓝宝石和尖晶石矿床的地质情况时，跟随其脚步，展开一场地下深处的冒险之旅。

随着白色软玉的价格暴涨，绿色软玉在中国的市场也在不断发展。 然而，有限的当地供应迫使中国不得不寻求外部资源，从而打开了进口开采于不列颠哥伦比亚、加拿大和俄罗斯西伯利亚绿色软玉的大门。 这样就开创了一条发展良好且苦心经营的软玉之路，连接三个国家。本文会对此进行介绍。

跟随 GIA 实地宝石学家见证泰国东部复苏的采矿作业和宝石市场。

跟随 GIA 的实地宝石学团队到赞比亚的祖母绿矿现场参观。

爬上陆克彦的危险石灰岩山脉，寻找该地区的红宝石、蓝宝石和尖晶石。

巴西是一个以珍稀动植物、足球、沙滩、丛林覆盖的群山闻名的热带地区。 其中的一些山脉就像纪念碑一样在城市中崛起，例如，位于五彩缤纷热闹非凡的里约日内卢的休格洛弗山就是这样的例子。 该国还有著名的亚马逊河，更不用提色彩缤纷、令人赏心悦目的绝美宝石了。