When I set out to make gems that would allow for multiple elements to be contained within, I did not expect that I would be spending so much time in the library, I thought there would be more actual making of gems, carving them properly, carefully crafting the runes. I have read so many books on gem properties, which gems attune well to both Fire and Earth magic, which gems have the capacity to hold both matrices within, and the results have been fantastic! I have my gem selected, and I've been able to replicate the cuts and shape super well. Runes were a little harder to find and make, but not terribly, in my findings runes that would work for both fire magic and earth were harder, most that I cam across would only accept one, and not both, but eventually I found some that worked well for what I wanted!