B2L2

If I don't have to pay, I will agree with you that the Tiffany is of course better since someone do pay the price.  

I got mine in HK at a wholesaler, then pick the band.  If you have time, they could do whatever style you ask for.  It is much cheaper than any big name jewelry stores in HK or those major jewelry stores here.

My ski buddy also works in this industry.  He had few customers just go online to bid for diamonds these days.  He said those online price is hard to fight.  You could try if you don't mind to take the risk.

Other than GIA, there are few other common cert for diamonds too.  Basically the same, but GIA is the biggest.  Without the cert, it is hard for a normal people to judge a stone.

Back then when I shop for mine, HK people were crazy about "heart arrow".  You need a good symmetry on round brilliant cut to get those heart and arrow.  Fun to watch on the first few days using the red lens, but I don't think my wife cares too much afterward.  Haha..