Contact the school or college from which you wish to get the original diploma. The original diploma is usually stored in the school records. Once contact has been established, the school will give you a time when you must call back and ask for further details.
Verify to the institute that you were a student. The school will require some sort of evidence proving that you were a student. Valid identification, a report card or even a transcript will do the trick.
Wait for the school to retrieve the original diploma. Depending on how long ago you graduated, your diploma may be stored in a records department outside of the main office or off campus all together.
Fill out the required paperwork. The school may ask you to sign certain papers that ensure you have received a copy of the diploma from them. A copy of the receipt would be kept with the school, and one copy would be given to you so that both parties can keep the record.