This depends on the method of fabrication - there are several. From my recollection of a Wired article from a decade ago, there was a then-new technique that produced diamonds that were indistinguishable from natural diamonds but for being maybe a little too perfect.
You do realise that the OP article was from 2006 while the article you cite is from 2009?
The article I cited was from 2003, but I'm not sure what the relevance is of the relative dates. My comment wasn't directed at the OP, but at the parent's question about fabricated ("cultured" ;) ) diamonds.
At the moment I believe labs can make anything you want diamond wise... And somewhere around 2012 diamond grading labs started issuing certificates for man-made/synthetic stones. http://www.gia.edu/gem-lab-service/synthetic-diamond