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I think this sounds like a great plan especially since your birth stone is sapphire. That diamond size would also make an amazing size pendant so it's like you get two new pieces of jewelry out of this solution, sapphire/diamond ring and a diamond pendant! What shape sapphire are you leaning towards? Round or oval I'm guessing? When it comes to a 3-stone I like it when the center stone is significantly higher rather than flush with the sides.
Keep it all diamonds and wear it on your right hand.