A woman has complained online about the size of her engagement ring. Bad idea.

A woman has turned to an online forum to ask if she is being unreasonable for being ‘disappointed’ by the engagement ring she was presented with by her partner.

The user – who remained unnamed – wrote on Mumsnet that she was unimpressed with the ring her new fiancé had picked out.

“[He] proposed and presented me with the ring he’d chosen – a diamond solitaire in white gold. I was so happy and excited to accept but was disappointed when I first saw the ring,” she wrote.

“The first word that entered my head was ‘small’. There’s nothing to dislike about the type of ring per se… but it’s the whole thing – the colour of the gold, the setting, the small stone and relatively chunky shoulders.”

She admitted that she thought her partner would spend a bit more than the AU$2100 her engagement ring cost.

"His salary is nearing a 6 figure sum and he's usually very generous," she wrote.

"Having seen the receipt I know he paid [AU$2100] for it – which is a lot less than I would have imagined he would have spent on such a significant piece of jewellery.

"As it's something I'll be wearing every day and is such a special piece of jewellery I wanted to really love it and I just don't."

She then asked for advice on how she should best handle the delicate situation.

But some users were quick to judge the newly-engaged woman, telling her she was being ungrateful.

"I'd be disappointed if I asked someone to marry me and they made a fuss over the ring," another person wrote.

"I mean someone wants to commit the rest of your lives together and you want to make a fuss over a ring?"

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Others were more understanding, arguing that liking the piece of jewellery you'll likely be wearing for the rest of your life is a pretty important factor.

"There's no way on earth I'd allow someone else choose a piece of jewellery for me that I'd potentially be wearing for decades," one woman wrote, adding, "I wouldn't even let my partner choose this year's winter coat!"

Some suggested the best course of action was to be open and honest about her feelings towards the ring.

"If this is the man you intend to spend the rest of your life with you should be able to have a conversation about this," one wrote.

"If it can be returned and you can pick something you like better, together, then do that, but I would probably try and stick to his budget or put the extra to it yourself if you chose something more expensive."

And if she needs some inspiration? These are the most beautiful engagement rings of 2017: