Moving on to the actual question, I…. do not have a gemsona! Ages ago I cranked one out that was a moss agate but as sometimes happens to me with characters, she sort of shuffled away from me and became her own character. I think if I was going to draw literally-me-as-a-Gem, and just going off the castes we’ve already seen, I would probably depict myself as a peridot, because I generally use robots as an extended metaphor to describe my thought process, and also I empathize with Peridot a lot.
I mean, my birthstone is amethyst, but I don’t think I’m quite big and buff enough to be a quartz.
Just picking a random stone, not necessarily if I’d seen it in canon? Uh, not looking deeply into meanings, I still think moss agates are pretty rad, and there’s yellow aventurine, which is all sparkly! Look at it!
There’s also sunstone, which is a beautiful and sometimes terrifying Sauron-rock, but that’s kinda… I’m staying away from that until there is specific evidence that Yellow Diamond is not a sunstone. I blog about YD a lot but I am not insinuating I am YD, mostly because a lot of my theories suggest that being YD right now at this juncture is not incredibly fun.