Need help: What would Ethan and Rupert have on their wedding rings?

[dragonyphoenix]

So the prompt at Taming the Must is diaglyph, which is the same thing as intaglio, a sunken or depressed engraving or carving on a stone or gem. Click here to see some ruby intaglio; they are quite beautiful. I have an AU Rupert and Ethan. Rupert went back to the Council but stayed with Ethan. They never invoked Eyghon in this verse. So, what kind of carving would they have on their ruby wedding rings?