AITA for telling a friend’s friend that her ring looks like genitalia?

I(24F) was invited to a dinner party by my friend, "Ashley"(25F) to get some drinks with some of our mutual and her friends. It was awhile since I'd seen some of these people, and there were a lot of girls I'd only seen once before. I was pretty quiet since I wasn't familiar with everyone (there were 8 of us total, 2 were my mutual friends and 4 were acquaintances).

One of Ashley's friends, notices that "Sarah" is wearing an engagement ring. Sarah is really happy and starts gushing about her engagement. All of the others get really loud and asked her a lot of questions about the ring, her fiancé, her wedding plans, and give their congratulations, which I do too. They end up spending the next 20 minutes at least talking about her plans. I don't know her, so all I can do is sit around and listen, which is no problem.

At one point, Ashley asked to see the ring since we were at a long table, and Sarah was on the other end. She passes it along to each girl and everyone looks at it and coos over it. It gets to me, and I take a look at it and I guess I was too quiet or made a face, because Ashley takes it from me and says, "What's wrong? Are you jealous?" I don't know how to describe rings, but it was a round diamond with other diamonds on the side of the big one and I swear, I just couldn't help but see a penis.

I looked online for some rings to explain here: Sarah's ring looked like this one, but with a diamond. https://imgur.com/a/wQGHVoA

Everything happened pretty fast. As Ashley was asking me if I was jealous, the others asked if I was okay since I was so quiet through dinner. I tried to recover and said that it was pretty, I wasn't jealous, and that I was just surprised, but Ashley asked me again what was so surprising about a ring. I got nervous and didn't know how to not be honest, so I just said that I'd seen something I couldn't unsee. She stared at the ring a little bit, and I could see her face change as she realized too but she passed it back and said she didn't understand me.

Sarah got a little quieter, but the others kept asking more questions and the conversation generally kept going and I thought I was in the clear. We left and after I got home, Ashley blew up my phone asking how I could be so heartless and that Sarah was texting her that she was so sad and she thought I had ruined her ring. Ashley says she's embarrassed because of me and because I wasn’t close to Sarah, I should have just shut up and said nothing, which I wanted to do, but they all piled on me! I said that it's just what I thought and that Sarah shouldn't be so concerned about what someone she doesn't even know thinks. She thinks maybe we shouldn't be friends if I treat her friends like this. I'm a little mad because I also feel like her friends didn't treat me nicely and should have left me alone when I was uncomfortable or Ashley should have stuck up for me. So AITA?