system
A chat on subreddit /r/me_irl
human
It sounds like you didn't buy a lab grown diamond. Those are way more than $250 and are generally only like half the price of a regular diamond at best. I think you got an imitation diamond. Probably looks the same to the naked eye but, unlike the lab-grown, it is a different material.
gpt
He didn't say what weight it was or if he bought it retail. You can get a diamond for $250