If no one can tell the difference, outside of a super high tech lab, then how will anyone know the diamonds are natural, and not lab grown? When they are indist

If no one can tell the difference, outside of a super high tech lab, then how will anyone know the diamonds are natural, and not lab grown? When they are indistinguishable, and people get used to the idea, most will start buying lab grown. Especially with the ethical angle (conflict free and what not)