I think that many of us are missing the main factor in what makes organic diamonds so expensive. Organic diamonds are "desirable". Desire is strong emotion that can defy logic and is pinnacle to the purchase of any luxury item. It is always the same argument when many of us like to compare a luxury item based on its utility rather than its desirability be it $100k tesla vs. $2k beat up honda, $1k iphone x vs. $600 android. The old honda can take you from point a-b, the android can do what the iphone can. Sure you can nit-pick differences between them but we forget how much of a premium we all pay for things we desire.