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Graduate Colored Stones (GCS) Graduate Pearls (GP) Applied Jewelry Professional (AJP) GIA also exists to educate the gem and jewelry industry and the general public through its publications and outreach efforts. Most notable of these efforts is the quarterly publication of the magazine Gems & Gemology, a respected journal in the field. The ...
IGI provides independent grading reports, colored stone reports, identification and appraisal reports, diamond authentication and attestations of origin, and laser inscription services. They also offers diamond and colored stone courses through IGI's Schools of Gemology. [7] Graduates from the IGI school of Gemology are awarded an IGI Diploma.
Gem identification is basically a process of elimination. Gemstones of similar color undergo non-destructive optical testing until there is only one possible identity. Any single test is nearly always only indicative. For example: The specific gravity of ruby is 4.00, glass is 3.15–4.20, and cubic zirconia is 5.6–5.9 . So one can easily ...
The number, size, color, relative location, orientation, and visibility of inclusions can all affect the relative clarity of a diamond. A clarity grade is assigned based on the overall appearance of the stone under ten times magnification, which is the standard magnification for loupes used in the gem world.
Gems & Gemology, Winter 2008, Vol. 44, No. 4. Details history and methodology of the GIA color scale. Wise, Richard W. (2016). Secrets of the Gem Trade, the Connoisseur's Guide to Precious Gemstones (Second ed.). Brunswick House Press. pp. 145– 162. ISBN 9780972822329
In 2017, SSEF became the first gem lab in the world to introduce radiocarbon age dating of pearls as a service to clients. [8] In 2020, SSEF and University of Zürich researchers unveiled a new methodology (published in the journal Scientific Reports [ 9 ] ) to extract DNA from precious coral samples and thereby identify the species of samples.
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Inclusions are one of the most important factors when it comes to gem valuation. They diminish the clarity and value of many gemstones, such as diamonds, and increase the value of others, such as star sapphires. [5] Many colored gemstones are expected to have inclusions which do not greatly affect their values. They are categorized into three ...