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切工：4C 的第四个标准
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。
石墨内含物形成钻石的八面体轮廓 (英语)
An inclusion outlined by minute graphite crystals within a diamond create an octahedral shape.
Book Review: Collector’s Guide to Herkimer Diamonds
书评：Collector’s Guide to Herkimer Diamonds（《赫基默钻石收藏家指南》），作者：Michael R. Walter（迈克尔·R·瓦尔特）。
Analysis of Yellow Diamond Melee for Color Treatment and Synthetics (英语)
A parcel revealed to contain natural, treated, and synthetic diamonds reinforces the importance of identification.
最大的蓝色高温高压合成钻石 (英语)
Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.
Ring with a CVD Synthetic Melee Diamond (英语)
A round-cut specimen set in a ring is the first mounted CVD synthetic melee diamond identified by GIA.
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