There is a simple way to verify it.

Certificates issued by national formal qualification inspection institutions can be inspected online, and the weight grams of the certificates correspond to the physical objects.

Accurate to two decimal places, so there is no possibility of fraud. If you copy many certificates, the weight data must be marked on the certificates. If the weight is not in grams, you can claim and defend your rights.

If you have any questions, just ask.

I hope the answer can help you.