Go ask your jeweller. They'll be able to point them out.
DeBeers has a quality campaign. They laser etch their "natural" diamonds so people can tell the difference.
The jewellers don't care. Especially in pieces with multiple small stones. It's more profit for them since the artificial diamonds are cheaper.
Seriously, the 21st century will be the century of carbon. They have found ways to grow diamonds into sheets. They will eventually use them to make super-super fast semiconducters (the current ones melt to easily ;-)) Carbon nanotubes will lead to Mega strong rope and fabric. There is a project to construct a "space elevator" which will make orbital tourism cost feasible.
DeBeers is living on borrowed time.
Ahh found a good link for you:
http://www.wired.com/wired/archive/11.09/diamond.html?pg=1&topic=&topic_set=NPR also did a piece on it, but I can't find it.