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So happy for you that your old diamond has great specs! Maybe wear it in it's current setting for a while to see if you still want to reset it? I have the same two necklaces (Tiffany DBTY YG and a diamond set in the same 4 prong setting). But I don't layer them. I find that when I wear more than one necklace, they tangle easily.
Your current setting looks really nice. I like how they did the prongs.
Another thought for a different setting, have you looked at the martini 3 or 4 prong setting fixed on the chain? Really pretty. I think Brian Gavin does it?