A public record, kept monthly.

What this is

GDCS values a lab-grown diamond from its 4Cs and from the brand's sustainability record. The record shows what 500 jewellery brands say about sustainability, and which of it someone independent has checked. It is built on the AIDI Trust Index. The current issue is September 2026.

What this is not

It is not a certificate and it does not grade stones. The value is a calculation from public figures. It is not an appraisal of any one stone, not an offer and not advice.

How a brand gets here

We read public documents. No brand asked to be included, and none paid.

If something is wrong

Send the public document to [email protected]. If it changes your record, the change appears in the next monthly issue, with its date.

Who publishes it

AIDI, the Association for Intelligent Diamond International, a not-for-profit incorporated in Canada. How AIDI is funded and kept independent.

Privacy

This site sets no cookies, runs no analytics scripts and loads nothing from other sites. A stone you describe in the console never leaves your browser.