It looks nicer (bigger diamond = better ability to see the cool prism effects and such), is clearer (same)
makes her look like she has a richer/nicer/more important fiancé
For me, if I couldn't afford the ring of a particular size, I simply get a nice ring of the size that I can afford. If she doesn't like it then, chances are, we aren't going to marry.

If it's truly identical to a from-the-earth diamond, who cares?
Also, synthetic diamonds are rather unlikely to be funding wars in the Congo...
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