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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. The IGI school was the first to offer the practical Rough Diamond course. [4]
The fifth clarity factor which is assessed is the color and relief of clarity characteristics. Characteristics that contrast with the surrounding diamond are said to have "relief". The degree to which this color and relief is noticeable affects the clarity grade of the diamond. Colored inclusions invariably show contrast and are more easily seen.
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.
These diamonds are graded using separate systems which indicate the characteristics of the color, and not just its presence. These color grading systems are more similar to those used for other colored gemstones, such as ruby, sapphire, or emerald, than they are to the system used for white diamonds. [14]
“A diamond is forever,” but perhaps not for the increasing number of consumers spurning the gemstone for lab-grown counterparts, gold and even other colored gemstones.
Gemstone pricing and value are governed by factors and characteristics in the quality of the stone. These characteristics include clarity, rarity, freedom from defects, the beauty of the stone, as well as the demand for such stones. There are different pricing influencers for both colored gemstones, and for diamonds.
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