Every stone re-graded before it joins the feed.

What we re-verify

• 4Cs against the certificate — carat weight, color, clarity, cut grade.
• Polish, symmetry, and fluorescence consistency.
• Measurements and depth/table proportions.
• Face-up performance under controlled lighting (10x and 40x).
• Inclusion mapping for VS-grade and lower stones.

Who does the work

Carat employs four GIA-graduate gemologists on staff. They are not commissioned and have authority to reject stones from the feed.

What we publish

Each PDP shows the certificate lab and links to the lab’s public verification tool, so you can confirm the certificate at the source. The desk note on each card is signed by the gemologist who reviewed the stone.