Hello Marion
Well for starters, Rolex never put (or puts) diamond bezel on TT watches.
Diamond bezels are ONLY reserved for solid gold and platinum watches.
Not saying a genuine Rolex bezel has been added though.
In saying that Rolex diamond bezels come in two configerations:
44 diamonds (older style)
52 diamonds (newer style)
Since the one pictured has 44 diamonds (yes, I counted them!) and the pave setting has 4 "claws", it may be genuine.
I know that the newer ones have the Rolex crown stamped on the underside of the bezel, not too sure about the older ones.
Hope this helps a little.
John.