A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.

This type of pink pyrope garnet, believed to have been mined in Tanzania, shows a distinct color-change phenomenon resulting from its unique chemical composition.

A report from the 34th IGC, held in Vilnius, Lithuania in August 2015.

A new type of African chalcedony with the trade name “Aquaprase” shows unique composition and attractive color.

Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided.

Archival research and gemological characterization reveal the true story of this 135.74 ct blue sapphire from the French crown jewels.

Rare material from Brazil features four-ray stars under point-source light.

An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.

Microscopic and chemical analysis may provide clues to the original source of Montana’s alluvial sapphires and help distinguish them from sapphires with overlapping properties.

Documents a trip to the renowned opal fields of Lightning Ridge, Koroit, Yowah, and Quilpie.

A semi-baroque pearl with an unusual radial feature is submitted to the Bangkok lab for testing.

浏览超人气超级碗戒指图库，从最初的美国国家橄榄球联盟 (NFL) 冠军赛到现代超级碗，令人目不暇接。

所有的珠宝专家都很熟悉深圳这座城市。它是全球珠宝制造中心，也是中国快速发展的宝石和珠宝行业的领头羊。 加入 GIA 团队，我们将游览整座城市，更深入了解这座城市的顶级珠宝品牌。

各拍卖行凭借屡屡刷新纪录的拍品，在 2015 年取得了极大的成功，为这一年发展并不顺利的珠宝行业带来了勃勃生机。

自 2006 年，GIA 开始将圆形明亮式钻石的切工等级纳入其鉴定证书，旨在以与颜色和净度相同的方式制定切工标准。 此切工分级系统以此前十年间进行的研究为基础；研究成果发表于《宝石与宝石学》(Gems & Gemology) 刊载的数篇文章中。

了解 GIA 切工分级系统对圆形明亮式钻石切工鉴定的基础知识，这将帮助您挑选出最惊艳的那颗钻石。

跟随 GIA 实地宝石学家的脚步，前往巴西克鲁塞罗碧玺矿，开启一段真正的宝石开采冒险之旅。 该矿每年生产 8 吨碧玺，同样如此让人兴奋不已的有色宝石产地少之又少。

澳大利亚盛产蓝色蓝宝石，它对全球蓝宝石行业作出了巨大贡献，至今仍左右着这个行业的发展。