@AspiringLuddite Dexter <https://www.familysealrings.com/> is one of two or so shops that can still engrave a seal into a gemstone. Those aren't cheap, but their solid silver rings are less prohibitively expensive.

(I've been happy with one of their rings that has my vert-and-argent arms engraved in green agate set in silver, but I was lucky to have a birthday with a nice round number around the time the Brexit referendum crashed the GBP/EUR exchange rate.)