Professional Evaluation
The diamond is examined using standardized gemological methods.
DIAMOND EDUCATION
Diamond Certification
Learn how grading reports document a diamond's characteristics and how to understand the information they contain.
KNOW WHAT YOU ARE BUYING
A Diamond Report Creates Clarity
A diamond grading report documents important characteristics of a diamond according to the grading laboratory's evaluation.
Learning how to read the report helps you compare diamonds using consistent information rather than relying only on appearance or descriptions.
Learn How to Read It
THE BASICS
What Is a Diamond Grading Report?
A grading report is an assessment prepared by a gemological laboratory describing characteristics observed and measured during the grading process.
Written Documentation
Important characteristics are recorded in a formal grading document.
Easier Comparison
A report provides information that can help buyers compare diamonds.
Detailed Information
Reports can contain grading, measurements and identifying details.
READ THE REPORT
Understanding a Diamond Grading Report
Report formats vary by laboratory, but many contain several important categories of information.
Report Identification
The report normally includes an identifying number or other reference information.
Diamond Characteristics
Key information such as shape, measurements and grading details may be listed.
4Cs Information
Depending on the report, Cut, Color, Clarity and Carat information may be included.
Proportions & Measurements
Measurements and proportion-related information can help describe the diamond's physical characteristics.
Additional Features
Some reports include diagrams, plotting information or additional observations.
THE 4Cs
How the 4Cs Appear on a Report
01
Cut
Describes how effectively the diamond has been proportioned and finished, where applicable to the grading report.
Learn About Cut
02
Color
Indicates the diamond's position on the applicable color grading scale.
Learn About Color
03
Clarity
Records the clarity grade based on characteristics observed during grading.
Learn About Clarity
04
Carat
Records the diamond's weight, generally expressed in carats.
Learn About Carat
IMPORTANT DISTINCTION
Grading Report vs Appraisal
GRADING REPORT
Describes Characteristics
A grading report provides information about a diamond's observed and measured characteristics according to the issuing laboratory's grading process.
- Describes diamond characteristics
- Documents grading information
- Helps with comparison
VS
APPRAISAL
May Estimate Value
An appraisal is a separate service that may provide an estimated value for purposes such as insurance or other financial considerations.
- May estimate monetary value
- Can serve different purposes
- Is distinct from grading
GRADING LABORATORIES
Why the Issuing Laboratory Matters
Different laboratories may have their own grading standards, terminology and report formats.
When comparing diamonds, identify the laboratory that issued the report and review the report details carefully.
Identify the issuing laboratory
Review the complete report
Verify the report information
IDENTIFICATION
Laser Inscription
Some diamonds may have a microscopic inscription on the girdle that corresponds to an identification number associated with a grading report.
When applicable, the inscription can provide another way to help connect the physical diamond with its report.
Identification reference
Microscopic detail
Connects physical stone and documentation
YOUR CHECKLIST
What to Check on a Diamond Report
Report Number
Confirm the report identification information.
Shape & Cutting Style
Confirm that the listed shape matches the diamond you are viewing.
Carat Weight
Review the recorded diamond weight.
Cut Information
Review available cut and proportion information.
Color Grade
Check the reported color grade.
Clarity Grade
Review the stated clarity grade and any relevant plotting information.