Help finding a quality engagement ring under $200?

Hi! My boyfriend and I are talking about getting engaged :) However, he’s still in graduate school and doesn’t have much money. It’s a bit ambitious but do you know of or is a recipient of a quality engagement rings under $200? Thanks in advance!

It’s just a symbol of our love, so I’m fine that he can’t afford a big diamond ring and I honestly don’t want him to. Please don’t say anything mean or make fun.

Edit: Thank you all for the suggestions, I’ll definitely try etsy and the other sites mentioned :)