What size round mirror over my fireplace?

Hello there. I’d like a change from my over mantel mirror which I feel is out of proportion. The width of the mantelpiece is 140cm and the height from the mantel shelf to the coving is 108cm. I’ve got my eye on this one from Laura Ashley which comes in either 60cm or 100cm diameter. I’m drawn to the larger size but that will mean probably resting it the edge on the mantelpiece because of the restriction of the ceiling height. Would this look odd with a round mirror and do you think it would even suit my fireplace? Many thanks.


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