Sorry, I’m not entirely sure which engagement ring we’ve posted/reblogged that you’re referring to exactly- but I’ll try my best to guess and help you find it!
If it’s this one(?), which seems to fit the description, then I found one on Esty that could be similar. That’s all I could find.
But if not, have you tried to search the description on Pinterest? I did a quick search there and they have a lot of options posted (and most have a source- thank god!)
I hoped I helped at least a little bit! Good luck, I hope you find what you’re looking for (: