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GIA is the founder of promoting the internationalization of diamond certification. GIA is a non-profit organization, and its funds are donated by people in the jewelry industry. Its main service scope is the education and research of jewelry design and professional knowledge, which is deeply recognized by the global jewelry industry. GIA is the founder of Diamond 4C, and the GIA standard is used as a reference by appraisal institutions all over the world. Diamonds with GIA diamond certificate are recognized all over the world. GIA's certificates are all classified and appraised for loose diamonds.
GIA diamond classification report and GIA diamond processing are considered as the first gem certificates in the world. Diamonds of all shapes and sizes are sent from all over the world to the college for analysis and classification.
Laboratory report: identification certificate number of diamond.
Date: The date when the diamond was identified.
Diamond shape and cut: mainly describe the shape and cut of diamond.
Diamond size: the size of a diamond, in millimeters.
Carat weight: describe the carat weight of diamonds, accurate to 1%.
Total depth: the ratio of the height of a diamond (round or irregular) to its diameter.
Table width: the ratio of diamond (round diamond or irregular diamond) table to diameter.
Crown height: the ratio of the crown of a diamond (round or irregular) to its diameter.
Senkaku depth: the ratio of a diamond (round diamond or irregular diamond) to its diameter.
Symmetry: the symmetry grade of a diamond.
Waist thickness: the thickness of the circumference of a diamond.
Undercarriage: the appearance of the cutting surface of the undercarriage.
Polishing grade: the polishing grade of a diamond.
Clarity grade: the clarity grade of diamond under 10 times magnifying glass.
Clarity structure diagram: a display diagram observed under a magnifying glass, which describes the shape of the diamond and the characteristics and position of the inclusions.
Color grade: The color grade of the diamond.
Fluorescence: visible light emitted by diamonds under ultraviolet radiation.
Comment: Description of other characteristics of diamonds not mentioned in the report.