Many memento mori rings were hidden inside the band, under a hatch, or deep within a bezel, such as this tiny magnified skull. The skull is only about 2mm wide, but with a nice resin dome it appears too big to fit in the bezel, which effectively becomes a peep hole.
I really wanted to use these millefiori sand dollars from Greg Chase to make glass beads for a ring. Alas, the first one turned into a black blob, and I’m just not that patient. To get the job done, I grabbed some crystal clear doming resin and gave it a whirl. Of course, there’s no flame, but the results are much better than my glass work.