Laboratory Services
The GIA Laboratory provides a variety of gem grading and identification reports. Diamond grading reports for unmounted natural and synthetic diamonds determine their key characteristics: color, clarity, cut and carat weight. GIA issues two types of reports, the more complete being the Diamond Grading Report (a briefer and less expensive version is called a Diamond Dossier). The reports contain a number of measurements, including of carat weight as well as a diagram of where and what types of inclusions are located in the diamond. Diamond grading reports are now demanded by most consumers purchasing diamonds over a certain size, typically for over 0.5 carat (100 mg), and almost always for over 1.0 carat (200 mg), and are considered an important tool in guaranteeing that a diamond is accurately represented to a potential buyer.
GIA colored stone identification reports may include a comment about any treatments detected and an opinion of country of origin for ruby, sapphire, emerald and tourmaline. Pearl reports specify the weight, size, shape, color, origin (natural or cultured) and presence of treatments.
Read more about this topic: Gemological Institute Of America
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