Check quality and authenticity of GIA diamond

Hi,

I am a complete newbie and I am about to buy an engagement ring with a diamond.

The diamond I have in mind is a GIA certified one and from what I can see the supplier offers it at about 35% cheaper than any other place (online and offline).

So I am a bit wary about the quality.

The supplier will give me the GIA certificate with the report number.

My questions:

1) Do all GIA diamonds have a laser inscription in the diamond that corresponds with the GIA report number?

2) If yes, can I see this laser inscription in the diamond when it is set in the ring?

3) Which tool would I need to see this... a diamond magnifier 10x or 30x or 40x or 60x, Triplet... which exact specifications would this little thingie need?

Thanks a bunch!