A certificate, also known as a diamond grading report, is a report issued by a gemologist/s , who have examined the stone by placing it under a microscope and analyzing its dimensions, cut, color, clarity, polish, symmetry and other characteristics.

The diamond grading report includes a full listing of the diamonds characteristics, verifying that the diamond is genuine.
Every loose diamond sold by DiamondSphinx.com has been analyzed and graded by one of the following: GIA, EGL, CGL or AGS which are some of the most respected independent laboratories in the diamond industry. The diamond is therefore considered guaranteed. Diamonds that are accompanied by these grading reports are the most highly valued in the industry as their quality is considered guaranteed.

The exact quality of a diamond (carat, cut, clarity, cut and more) are critical to its value.
A diamond improperly graded can have a large effect on its value. It is important that the diamond is examined and graded by a known independent gemological laboratory, who do not have a conflict of interests when examining and grading the diamond one way or the other.

There are no specific laws that regulate how diamonds are graded, but there are standards. Many gemological institutes exist that can grade a diamond and issue a certificate for it.
There are differences in the grading of a diamond among different institutes, however when issued by the most trusted and respected ones, they are very similar in grading.
DiamondSphinx.com deals only with high-end laboratories ensuring the diamond certificate's accuracy and your peace of mind.

When purchasing a diamond, you should expect its diamond grading report with it, which is your best guarantee of that diamond's quality and value.
Every loose diamond sold by DiamondSphinx.com comes with its certificate.