Is trying on someone else’s engagement ring a faux pas?

Exactly - you try it on and pretend to be blinded by the diamond. Saying you don't want to would be like saying you don't want to hold a new baby that is being handed to you.

I don't think it's weird - in fact it is usual in Ireland (where I'm from). Rude not to!

I don’t think it’s weird or a faux pas at all. My sister tries on all my rings and I don’t think she’d have a problem letting me try on her engagement or even her wedding ring if I really wanted to. I don’t see the difference between trying a ring on and just holding it so you can see it better, it would be weird to do that with her finger still in it!

I let my sister and cousin try my engagement ring on. Didn't think anything about it tbh.

I wouldn't ask to try on a friend's ring but sister's would be ok I'd say. What I find it strange is that with such a close relationship your sister didn't feel able to say "actually, I'm getting a bit protective over my ring at the moment, I'd prefer not to let anyone try it on for now". She agreed but apparently resented you for asking...

It's a tradition in Ireland! You try it on and make a wish, which can't be for love nor money
It was baffling me to see the first few responses saying it was weird and inappropriate!

I thought it's a thing? Everyone tries on the ring, rotate 3 times towards the heart. Anyone know of this? Maybe it's an Irish thing, everyone around here does this but like many old traditions I have no idea why.

Very odd! I've tried on most of my closest friends engagement rings. It was part of admiring them when they were new and totally normal in my friendship group.

I try friend’s glasses on and vice versa. Why would that be odd.

Only if it gets stuck on your finger and your future BIL wants to marry you secretly Family Stone film plot

With the same ring? 😬

I wouldn't even think to ask but that's besides the point. It sounds as if you and your sisters relationship is changing, especially on her side and if you still want to remain close then you will both have to kindly adjust to each others boundaries that pop up.
Have a little chat and let her know you are open to her voicing things she is not ok with and vice versa.

I'm in Ireland and it's traditional to do that.
Traditionally you can't wish for a man or money but you can wish for a rich (and generous) mother in law.

I just wish for a happy marriage for the newly engaged couple.

That is hilarious, it's cultural here to put an engagement ring on an unmarried woman's finger and turn it three times and make a wish.

Never heard this! We all tried on each others rings when we got engaged, fancy jewellery, what's not to love? Your sister is being weird.

You're meant to try it on and turn it 3 times towards your heart for true love!

If any of my close friends wanted to try on and wear my engagement ring, I wouldn’t mind at all.

I wouldn’t have done it, nor would I have allowed anyone to try mine on. Like wedding rings, they are just for one person to wear.

I wouldn't let anybody try on my wedding or engagement rings and I would never ask to try on anyone else's.

But if you'd have asked me I'd have just said no, not let you try it on and then raise it in an argument at a later date.

Some boundaries in your relationship might be a good thing, from your posts it sounds like maybe you have never really progressed from your childhood sibling relationship and almost see her as an extension of yourself.

It's a tradition where I'm from to try on the ring twist 3 times and make a wish , you did nothing wrong.

I believe you that you didn’t mean to cause offence. But it doesn’t follow that your sister only mentioned it to hurt you. It’s more likely that she did feel uncomfortable at the time but it only came out during the argument. I don’t think she’ll take it to the grave though. It’ll be forgotten soon enough.

I wouldn't have an issue with letting someone try on my engagement ring. I'm sure I allowed friends, sisters-in-law, whoever to try mine when I got it (about a thousand years ago). If they were struggling to get it on I might call a halt in case it got stuck, but it really wouldn't bother me.

But then, I swap my engagement ring around with other rings that fit my ring finger, so I'm maybe not the person to ask. I sometimes wear a diamond engagement ring that used to belong to another woman (my late aunt) for example, or a pretty emerald ring that DH bought me one Christmas, or the antique one I got for my last birthday. I'm not that sentimental about my actual engagement ring, but I do think it's the most beautiful piece of jewellery I own.

My wedding ring is probably more precious; I wouldn't let anyone try that on.

its just more upset that all of a sudden there are these rules between us Awh, sorry you're feeling like that. A sister getting engaged is a big thing but things will settle into their new normal soon enough. I don't know about you but my sister and I always have a big row when things are feeling a bit unsettled. I think it's because we feel safe enough to let off a bit of steam with each other. Just let it blow over; I'm sure it will.

When I got engaged I let people try on my ring and similarly I've tried on friends & sisters rings. I never knew it wasn't ok. 😂 I don't understand why that is offensive. It's usually cause someone thinks its pretty and want a closer look and see what it looks like on their hand. I think it's a compliment. Probably depends on where you're from and who you hang out with but with a sister it really shouldn't be a thing. My sister got a gorgeous ring from her husband for her 50th and we all had a go at trying it on and seeing it sparkle. 😂 Now getting it stuck on your hand would be a whole different story ...