GIA vs IGI: what matters when selling
A lab report helps buyers verify what they’re evaluating. The biggest difference is grading confidence and how much re-checking is needed.
The short version
- GIA is commonly treated as the strictest benchmark for natural diamonds.
- IGI is common for lab-grown diamonds and many natural diamonds—still useful, but often verified more closely.
- If a grade is uncertain, buyers may price more conservatively until verification.
Why reports affect offers
- Time to verify: unclear or inconsistent grading can slow evaluation.
- Risk: if the stone must be re-graded, the buyer is taking on extra cost and uncertainty.
- Market expectations: certain markets price more confidently around specific report types.
What to bring
- Report (or report number)
- Clear photos in good light
- Any box/papers for branded jewelry