I like this remount idea.
This was originally an engagement ring with a Tiffany peg head mounting for the major diamond. It was retired to a right hand ring and she wanted to change it up and add diamonds to the ring. The three stones that she had and wanted to use where of slightly different sizes. Since the one was set in an halo pendant already, she thought it would be cool to use that for the center. The other two diamonds would flank it in standard low base heads. The fact that they are different sizes became less noticeable with the pendant separating them. I love the way it turned out using all the bling that she already had. A totally different ring from the original design. (Sorry, no “before” picture. Just the “after”)