Authenticity Code

Each Goldmark Oakham-certified diamond comes with an assurance that your diamond is authentically Goldmark Oakham.

When a Goldmark Oakham diamond is cut and polished, a unique serial number is assigned to the stone which is then laser engraved on its girdle together with the G.O logo.

This inscription is so small that it’s invisible to the naked eye and can only be seen using a microscope or diamond loupe.

The same number can be found on the certificate card that came with your stone.

You can enter this number below to verify if your diamond is an authentic Goldmark Oakham diamond. A Goldmark Oakham diamond will always have a unique laser inscription and be accompanied by a Goldmark Oakham Report.