Diamond Certification, Explained
For larger diamonds, independent documentation is an important part of the buying process.
A grading report provides information about the diamond itself, including whether it is laboratory-grown and how it has been evaluated.
What does a diamond report include?
Depending on the laboratory and the type of report, a grading report may include carat weight, measurements, color, clarity, cut or finish, polish, symmetry, growth method, post-growth treatments and identifying inscriptions.
The purpose is to give you a standardized record of the stone rather than relying only on a retailer’s description.
Which laboratories grade lab-grown diamonds?
Independent gemological laboratories including IGI, GIA and GCAL evaluate lab-grown diamonds.
Report formats and terminology can differ, so the most important thing is to understand what the specific report accompanying your diamond actually covers.
GRWN diamonds are independently documented, with additional grading provided on qualifying stones according to the brand’s standards.
What is a laser inscription?
Many graded diamonds have a microscopic inscription on the girdle.
This can include the grading report number or an indication that the diamond is laboratory-grown. The inscription is generally too small to see without magnification.
It allows the stone to be matched to its documentation.
Does a grading report tell you if a diamond is beautiful?
Not entirely.
A report gives you important technical information, but two diamonds with similar grades can still look different in person.
Proportion, facet pattern, light performance and the overall balance of the stone all affect the final appearance.
Certification supports the decision. It does not replace looking at the finished diamond.
Grading is not the same as sustainability certification
These are two different things.
A gemological report evaluates the diamond’s origin and quality characteristics.
Sustainability certification looks at areas such as sourcing, environmental practices, traceability, governance or broader business standards.
At GRWN, both forms of independent verification serve different purposes: one documents the diamond, while the other supports the standards behind how the jewelry is produced.