CaratSignalFind My Diamond — $99

Buyer research · Certification

Diamond Certification & Grading Reports

Learn what a grading report records and how to verify the document for a diamond.

A grading report is documentation about a diamond, not a guarantee of a retailer’s claims or a formal appraisal of value. Match the report details to the listing and confirm the issuing organization and report identity using its official resources.

1 published guides3 research areasCaratSignal does not imply affiliation with grading laboratories.

Questions to orient your research

What buyers ask

GIA vs IGI: what should I compare?

How do I verify a report?

Does a certificate prove a diamond is a good value?

Research map

Topics covered in this hub

Mapped buyer questions

Questions to start with

Follow a question to a published answer or its broader topic hub.

Buyer questionWhat should I compare when looking at GIA and IGI reports?Read the researchRelated questionDoes a grading laboratory determine whether a diamond is good value?Read the researchRelated questionDoes GIA certify diamonds?Read the researchRelated questionHow do I verify a GIA report?Read the researchRelated questionHow do I verify an IGI report?Read the researchRelated questionWhich report should a lab-grown diamond have?Read the researchBuyer questionHow can I verify a diamond grading report?Explore the topicRelated questionHow do I match a grading report to a diamond listing?Explore the topic

Browse the library

Guides in this topic

Published guides include their research dates, source record, and related buyer questions.

CaratSignal ResearchGIA vs IGI: Which Diamond Grading Report Should You Trust?Last researched September 28, 2026

Related topics

Continue your research

Diamond Clarity & InclusionsUnderstand clarity documentation, visible characteristics, and what to check in a specific stone.Diamond Cut & Light PerformanceLearn which cut-related information to request and how to review it.Diamond Prices & ValueUnderstand what a listed diamond price does—and does not—tell you.

Research, not retail

Have a specific diamond listing?

Get clear analysis before a major purchase.

Find My Diamond — $99