Knotty, of gemshippingtrash! That’s the ruler of gem egg hell, though I will warn you that cannibalism was the latest thing the last time i checked out their blog, and it squicked me out, so be careful! I dunno what the latest thing is now, though! It could still be cannibalism!
And, it’s pretty much just someone asking, “what if the gems laid eggs?” and then someone else come in with, “what if they hatched??” and that’s it, really! The oviposition kink seemed to take off pretty well in the fandom, though some just like it for the gemlings, which are the gems that hatched from the eggs. Hope that explains it! If not, let me know, and I’ll try to explain it better!