The grading report of a diamond is like its identity card. Gemologists can confirm a diamond's identity based on its cut angles, clarity flaws, and girdle inscription.
The report will also tell you if a diamond was mined from a mine or produced in a lab, or if it has undergone treatments. In combination with the four Cs (color, clarity, cut and carat) you can determine the quality of the diamond.
A diamond grading report gives you peace of mind that the diamond you pay for is the one you get.
The cut proportions and clarity characteristics act as a sort of "fingerprint" for your diamond, allowing others to confirm that it is the same diamond on your report.
Laser engraving with number on the girdle of the diamond
All Green World Diamonds (except the very small diamonds) have a laser engraving with a number (girdle/belt inscription with the report number) you can read this number with a magnifying glass on the diamond girdle and this is also written on the certificate. This gives you optimum certainty and security.
The certificate also states that it is
is a real diamond "Diamond" is a Lab diamond whether it was bred with HPHT or CVD
ATTENTION with "own certificates" = brand or shop diamond grading
Some brands/sellers have their diamonds graded internally instead of sending them to an outside gemological lab. While a few are remarkably consistent, like Tiffany & Co, most have somewhat loose standards → uncertainty about quality (Color, Clarity, etc.)!