There's a bunch of tags for the various Gem species from SU, made by user #1253215.
pearl_(species)_(steven_universe)
ruby_(species)_(steven_universe)
rose_quartz_(species)_(steven_universe)
jasper_(species)_(steven_universe)
lapis_lazuli_(species)_(steven_universe)
diamond_(species)_(steven_universe)
The main issue with these tags is that most of them refer to a single character. The only exceptions are Diamonds and Pearls, of which there are 4 each.
I don't wanna move on to nuking or deprecating because I feel like these tags could potentially be useful for tagging very minor gems who happen to be of that species, but the way it's being used right now feels like e621-tier tagging.
Other tags in the same vein are homeworld quartz uniform and homeworld lapis lazuli uniform, which feel redundant with homeworld gem uniform.
