Commitment to Confidence
IGI screens every diamond using state of the art technologies to determine naturally mined, laboratory grown or simulant origin. Experienced graduate gemologists conduct further assessment in controlled conditions, detailing relevant gemological characteristics according to the strictest international system. The presence of any permanent treatments will be noted in the comments section. IGI will not issue full grading reports for diamonds with non-permanent treatments.
Gemstones should only change hands when accompanied by a grading report attesting to quality. Regardless of location or marketplace, an authentic IGI Laboratory Report is the common language of trust and confidence in the gemological world.
How to read an IGI Natural Diamond Report
The IGI Natural Diamond Report includes the gemstone’s description, as well as its shape, cutting style, measurements and 4Cs assessments: Carat Weight, Color, Clarity and Cut.
Diamond reports may also include a graphic representation of the diamond’s proportions, a diagram of its clarity characteristics and a comment about its laser inscription, if one is present.
For round brilliant diamonds, the overall proportions are compared with IGI studies of brightness, fire, scintillation and pattern to determine the Cut Grade. Fancy shaped diamonds are assessed using a four-step system combining finish assessment with proportions qualifications, shape-specific requirements and light return grading. All diamond shapes and colors will have craftsmanship grades for polish and symmetry noted on the grading report.
Diamond color is graded in a standardized viewing environment. IGI gemologists analyze color in the D to Z color range with the diamond placed upside down, viewed through the side, to facilitate a neutral view. Multiple graders submit opinions independently, with no collaboration, and the grade is determined when there are sufficient agreeing opinions. Diamond clarity is assessed at 10X magnification. Grading depends on the visibility, size, number, location and nature of internal and surface characteristics at that magnification. Diamonds with characteristics which are immediately obvious or noticeable are likely candidates for lower grades, whereas diamonds with characteristics which are minor, minute or extremely difficult to see at that magnification may qualify for the higher grades.
IGI co-created the modern laser inscription process. Using a very fine and precise laser beam, alphanumeric characters, a brand logo or even a personalized message can be inscribed on the girdle or outside circumference of a diamond. Adding the report number to a diamond’s girdle with Laserscribe permits fast identification of a gemstone under magnification, verifying of all of its gemological details. Now standardized as an efficient and easy way to identify a diamond, the majority of diamonds around the world have laser inscriptions.
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Lab Grown Diamonds
Did you know? Only natural and lab grown diamonds score 10 on the Mohs hardness scale; nothing else comes close.Learn More
Did you know? Diamonds of the same carat weight do not necessarily appear to be the same size.
Did you know? Gemologists perform D to Z color grading with the diamond upside down, viewed through the side.Learn More
Regardless of location or marketplace, an authentic IGI Laboratory Report is the common language of trust and confidence in the gemological world.All Reports