Engagement rings (NOT FOR ME)

[Bill86]

Okay so it's looking like my brother is looking at these and I have ZERO advice to offer, besides the obvious "don't do it" .

Anyways he asked if I would post this as I know a lot of you are married or getting married.

Basically this is what he is looking for (I don't really understand most of it)

1.25-1.5 Caret
Round Stone
VS 1 to SI 1
Color F-I
Very good - Ideal Cut

I have no idea what he is willing to spend on this or how soon he's going to buy one but it's looking like ASAP.

School me on buying an engagement ring of this type. Where to buy is probably the ultimate question. He obviously wants something nice, but only knows what he can google. He has no personally experience or friends with experience (he's only 24).