I may be stating the obvious but it appears that you have to appear here to have a graduate badge - healthunlocked.com/!/#couch... (you may have to paste this link into your web browser).
So it seems if you are a graduate and missing your hard earned badge - click on to support.healthunlocked.com/... and send an e-mail requesting it back.
The original green version seems to have been replaced with a grey one but a badge is a badge...
Mine took 24 hours which seems better than waiting in hope.