Is there reason to believe this is not the case?
As an aside, has anyone ever purchased a lab grown diamond? What was your experience? Where did you purchase it?
They sell extremely cheap lab growns with a lot of funny marketing around how "artificial" diamonds are for "light" occasions.
That's because Lightbox is run by De Beers and it's a PR campaign to flood the market with cheap lab grown diamonds with accompanying marketing to push the message that "real" diamonds are more valuable.
Funny thing is, I don't think millenials care about whether the diamond is lab grown. To them it's just a cheaper diamond that is literally the same as one from the ground and doesn't have any conflict diamond associations. De Beers think they're doing something clever but really are just shooting themselves in the foot by not understanding the younger market and giving us access to cheaper diamonds.
I'm a big fan of lab grown. Science is science, I don't need a poor teenager clawing a rock out of the dirt to make it real.
Bought it at a local helzberg store.