I have a milestone birthday coming up and I am really considering upgrading my center stone. I currently have a 3 stone ring and had hoped to get an upgrade on our 10 year anniversary but ended with a new band instead. DH seems to want to hold on to my ring due to sentimental reasons while I want something bigger. My compromise is to keep the side stones and setting and then turn the center to a necklace. Does this sound like a feasible and not an expensive route to take? The center stone I have now is .67 H SI1. I want to go up to at least a .90 $5K-$6K just for the stone. Obviously that budget will be less if I trade in to the place that we got my ring from.