My clients got married 20 years ago, and at that time I made them the betrothal ring above, with an ancestral diamond hidden under a small “temple” and the words Mazel Tov in Hebrew letters in the archways.
Sadly, the ring was stolen in a ghastly burglary. Happily, the insurance covered it.
I have remade the ring, with some minor variations. If you click on any of the pictures you will see them at a larger-than-postage-stamp size.