Certification is the key to selecting a quality diamond at the lowest price. Certification is your only assurance of quality. A diamond certification is a detailed diamond quality report issued by an accredited independent gemological laboratory
GIA Certification
G.I.A. - The Gemological Institute of America: G.I.A. is the most well known and respected laboratory in the world. The division of G.I.A. which is responsible for the certification of diamonds is G.I.A.’s Gem Trade Laboratory. The G.I.A. diamond quality report provides a carefully drawn plot which illustrates the exact position, size and shape of every internal inclusion and external blemish a diamond possesses. G.I.A. is extremely strict in assigning color and clarity grades. If a diamonds quality is on the line of the next higher quality grade G.I.A. will usually always assign the lower grade. G.I.A. uses a Sarin proportion analyzer, a computer electronic measuring device to determine diamond proportions.
Sample :
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G.I.A. Certified Diamond Reports provide this information:
- Shape
- Measurements
- Weight
- Depth Percentage
- Table Percentage
- Girdle Thickness
- Culet Size
- Polish
- Symmetry
- Clarity Grade
- Color Grade
- Fluorescence
- Comments about Diamond
- Plot of Internal and External Inclusions
Before you buy a diamond you should always, as a first priority, insist on an independent diamond grading certificate from an accredited laboratory
November 8, 2008
[...] How GIA Grades Diamonds? Posted by admin on September 08, 2008 Diamond Videos I found this interesting video made by the GIA itself. It explains how they grade diamonds. That is a very nice visual explanation of the diamond 4 C’s and other diamond related information. For more information, read about the GIA Certification and Certified Diamonds [...]