Is this sale a bit sketchy ?

So I’m selling my engagement ring on Craigslist. I know there’s a lot of scams out there. I was hoping to meet up in person and have the person meet at a diamond place to confirm they are real diamonds. This guy isn’t at all & wants it for sure ? Any advice ? I’m not sure what to do. I would like to sell it but I’m scared he might dispute the sale with PayPal saying they aren’t real diamonds and somehow end up w the money back. I’ve been told PayPal is safe ? What should I do ?