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GIA (The Gemological Institute of America) - the foremost gemological lab
Diamond Whisperer grades its diamonds based on GIA standards. See an example of a GIA grading report.
Girdle -The (usually) narrow area between the crown and pavilion.
The (usually) narrow area between the crown and pavilion on the perimeter of the diamond. The girdle can be as thin as "Extremely thin," which can be an area of weakness on the diamond, or as thick as "Extremely Thick."
Grading - How (& by whom) the diamond is graded?

Gemological labs, appraisers and independent gemologists grade diamonds and often provide a certificate or report for that diamond showing the size, shape, color, clarity and other characteristics. Unfortunately, these labs and appraisers each have their own ideas of color, clarity and some other characteristics. As such, a D color, VS2 from one lab could well be graded as an F color SI2 by another lab, or vice versa. This can result in a 50% swing in the value.
Diamond Whisperer grades all diamonds based on the GIA's (Gemological Institute of America) standards. GIA is a non-profit organization and the foremost industry expert in grading diamonds. Importantly, we feel they are the most consistent grader and are considered within the diamond industry as being the pre-eminent graders. As such, Diamond Whisperer is able to offer consistent pricing across the diamonds we value as we can rely on the grading.

Download the GIA Diamond Grading Report Podcast

So, what if your diamond is graded by another lab? Is it graded incorrectly?Not necessarily. We have found that some other labs are more generous with their grading than GIA, but this is not always the case. We will always review your diamond before giving a final valuation, so you will know for sure what diamond you have.
Graining - lines or curves that appear whitish, colored or reflective.
hese lines are caused by irregularities in the crystal growth.