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.

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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.

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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.