I am looking for settings that make the center stone look bigger...
Kind of like the one circe posted in this thread:
https://www.pricescope.com/forum/show-me-the-ring/illusion-set-diamonds-t105005-30.html
You'll probably have to scour vintage jewelry stores and websites. I saw a few examples when I was researching my grandmother's ring. From my limited knowledge this style of ring was popular in the 40's. Here's my grandmother's, is this what you were looking for? It's two tone, the three "stone" sections are all white gold.