Diamonds are also product of nature, but when we grow them in a lab they aren't often considered to be "naturally formed". It's just that the lab we used in this instance was part of the Jornada del Muerto.
Very small diamonds can be created using detonation.
Side note: Jornado del Muerto translates to English as Journey of Death.
> when we grow them in a lab they aren't often considered to be "naturally formed"
Isn't this solely because De Beers wants to keep the product of their mines artificially priced higher? So they come up with phrases to make lab grown diamonds sound less than the ones they mine?