A diploma certificate attests to having successfully completed a certain technical or engineering degree. It is frequently given out by a facility or a school. 

Diploma certificate attestation In UAE is an easy process. You will receive a document bearing the seal or stamp of the relevant educational or technical educational board in each nation. You can take this diploma or educational certificate to any office for attestation, and they will check it for validity and offer you a stamp or seal to put on your diploma certificate after authenticating it.

Source: https://www.attestationintl.com/diploma-certificate-attestation-in-uae/