Lot of 2 popular Large Gemstone Rings Semimounts for Repair

popular These beautiful rings are sterling silver.

Both are unfinished but I am unsure what was supposed to be in the spaces on each side of the stones - inlay? enamel?

The topaz is a size 7 and weighs 11.7 grams.
The amethyst is a size 8 and weighs 12.6.

Condition: Excellent