Thanks to everyone who helped with the decision! 
This is what I chose in the end:
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3172031.htm
It's a real sparkler
Nothing I saw in B&M stores comes close
If this what an expert stone looks like; I can't even begin to imagine what an ACA could do.



This is what I chose in the end:
http://www.whiteflash.com/loose-diamonds/round-cut-loose-diamond-3172031.htm
It's a real sparkler

Nothing I saw in B&M stores comes close
If this what an expert stone looks like; I can't even begin to imagine what an ACA could do.



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