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Certification · 4 min read
How to Read an IGI Diamond Certificate
A certificate makes diamond comparison more transparent, but it should be read as a full specification, not a single number.
Certificate number
Match the certificate number with the stone listing and the document provided.
Use it as a traceable reference for viewing, setting, and after-sales service.
The 4Cs
Carat describes weight, not the entire face-up size.
Color and clarity should be balanced with shape and budget.
Polish, symmetry, fluorescence
Polish and symmetry indicate finishing precision.
Fluorescence should be reviewed with real imagery instead of judged by one word alone.
Frequently asked questions
Should I buy a diamond without a certificate?
For center stones or higher-value diamonds, an independent certificate is strongly recommended for transparency.
LUX GEM
Want to compare stones before deciding?