Honestly, I do not know the hiring process in Singapore, but in my experience, most companies will not really care about diploma's. They request that you hold diploma X, but they will not truly verify this. The most I've ever had to do was upload a scan of my diploma, which would make forging it a lot more easy thatn produce the true thing with the watermarks and all.

Immediately after graduation people might still care, but later on, barely anyone cares.

But things like this go to show that perhaps people should care more...