GIA and IGI Diamond Reports: What to Compare

A diamond report helps describe a particular stone. When comparing GIA and IGI documents, start with the diamond's origin, the report type and its date. The laboratory name alone does not establish the right price or tell you which diamond you will prefer.

Read the Actual Report

Check the report number, measurements, weight and the information provided about color, clarity, cut and treatments. The fields available depend on the report and the stone. Compare the full documents rather than assuming every service includes the same information.

Neither laboratory manufactures the diamond by issuing a report. A report also differs from an appraisal: it does not promise a resale value or future appreciation.

Distinguish Natural and Laboratory Grown Services

GIA introduced an updated laboratory grown diamond assessment service in October 2025, using Premium and Standard quality descriptors for qualifying stones. Do not assume a newer assessment uses the same terminology as an older document or a natural diamond grading report.

IGI describes its diamond report services, including reports identifying laboratory grown diamonds. Read the specific document to understand what was assessed. An older report should be interpreted according to its own service and issue date.

Verify the Document and the Stone

Use the issuing laboratory's report check service. A matching online record confirms the record exists; the physical diamond still needs to be matched to it. An inscription, when present, is one part of that examination.

Avoid a fixed rule that one laboratory's grade always converts to another grade or commands a set percentage premium. Inspect the individual diamond and compare current offers for genuinely similar stones.

Choose With the Full Picture

Consider appearance, origin, dimensions, condition and the finished ring's price alongside the report. Ask our team to explain the documents supplied with a diamond before you decide.