Hi I was wondering if anyone could tell me (by using examples) how big a 4 carat emerald cut diamond ring is?

Below is a question someone had about emerald cut diamonds:
I was just interested in getting myself a 4 carat emerald cut ring but I don’t want it to look too big so I was wondering if anyone could tell me, by giving examples (like the size of a thumb nail or something) how big it would be? Thanks!

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