Makes total sense. Lab-created diamonds have been indistinguishable (for the typical consumer) from natural ones for years. DeBeers kept jewelry retailers in line in pushing "real" diamonds, but it was just a matter of time until something happened to shake that hold lose. Given the rapid switch away from gold for wedding bands etc after the 2008 crisis led to a major price spike, it is not surprising to me that jewelry consumers are willing to question whether "real" diamonds are worth the premium cost as well.
Might lab-grown diamonds have reached a point of being indistinguishable from natural diamonds such that people pass off lab-grown diamonds as natural diamonds without anyone being able to tell?
If you buy a certified diamond they will come with a laser engraving that indicates it was lab grown. They can tell if it was lab grown with special equipment and/or the chain of purchase. So, I guess you'd have to believe the certification company if they say it is NOT lab grown and that's what you want.
I have read that the distinguishing feature is that natural diamonds have flaws. Entrapped dirt or what have you that is not found in the sterile environment of the synthetic ones.
Maybe a specialist could tell a natural, formed over thousands of years, flaw from a lab-grown flaw, but really I think it's more like you can get a better grade from a lab (and especially with consistency, frequency, at a much lower price due to being rare to find naturally occurring). i.e. you can get flawed and coloured lab-grown diamonds too. (A mix of taking less care/time, older equipment, and binning the results like silicon wafers I assume.)
