Figure 1. The De Beers SYNTHdetect, an instrument designed for screening of colorless to near-colorless diamonds of all cuts mounted in jewelry. Loose stones can also be screened with no lower size ...
Figure 1. Diamonds such as this 1.15 ct round brilliant are some of the most highly sought-after gem materials and may contain inclusions that give the gemologist clues about their origin or treatment ...
Below is the list of recognized holidays when GIA locations will be closed.View the holiday schedule for all GIA locations worldwide.
An Identification Report, with geographic origin added. For polished, loose or mounted natural alexandrite, emerald, jade, Paraíba tourmaline, red spinel, ruby, and ...
Large crystals of chromium-containing synthetic forsterite are being commercially manufactured for use as a laser material. Considerable color variation is possible, and some of this material ...
Dye treatments in yellow or “golden” cultured pearls have improved to the point that some samples show little surface evidence. In addition to routine gemological observations, analytical techniques ...
The soothing soft pink shades of rose quartz appeal to gem carvers and collectors. – Valerie Power, courtesy Arunashi People accept a certain amount of sand, dirt, and dust as ordinary ingredients in ...
In an effort to help you understand the GIA Cut Grading System more fully, and to make the best use of it in your business, we provide these informative charts and booklets that summarize the system, ...
Infrared spectroscopy is a powerful tool for gem identification and research. Absorptions of a gem material in the infrared region of the electromagnetic spectrum are due to vibrations in the crystal ...
Practice the same time-tested procedures and identification skills used by the Institute’s renowned gemological experts. Tools used include a microscope, a refractometer with polarizing filter and a ...
330 克拉的亚洲之星收藏在国家自然历史博物馆中 -Chip Clark,Smithsonian Institution 友情提供 传统上，蓝宝石象征着高贵、真理、真诚和忠诚。 长达几个世纪的时间里，蓝宝石用于装饰皇室及神职人员 ...
宝石品質のダイヤモンドは、元の結晶形状からどのように形成加工されようとも、他の宝石には見られない輝き、きらめき、ファイアー、純度の複合された性質を持ち合わせている。
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