system
A chat on subreddit /r/me_irl
human
Hand painted art vs. mass prints of digital art would be a good argument i guess. Diamonds were forged by the earth. Lab grown were designed by the hand of man. Beauty is in the eye of the beholder. Me, personally, I would prefer a factory sealed-PS2.
gpt
Diamonds were harvested from the earth by man, cut and polished by man, inlaid into a ring made of metal mined by man, refined by man, and smelted by man. 

Lab grown diamonds were harvested from the earth by man as different materials, grown by man, and then everything else is the same.

So either way the raw materials were provided by the earth, and the ultimate product was forged by man. Unless you can just dig a hole and pick diamond rings out of the ground, the earth doesn't forge shit.