Is it safe to buy an engagement ring online?

The short answer is yes, with some qualifiers. Make sure their are complete descriptions and a certification. I think it should be someone that deals with engagement rings at least as a major department. Be sure that they have good verified reviews, both for the type of ring you are looking at but also for the company as a whole. A verified return policy that works for you. I also think that it should be an established company. Good luck.