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
Lab made diamonds are only possible due to all of the science and engineering of our ancestors, thousands of years of toil and hard work to finally be able to master making diamonds....or you know just get a slave to dig it out the ground.

I guess this is a great example that you can't reason someone out of a position they didn't reason themselves into, a lifetime of DeBeers (the fucking spell check knows that name for fucks sake) adverts and social engineering is hard to undo.