If there's one thing the SU fandom loves, it's getting hooked on the latest plausible theory and run with it to the ends of the Earth. Even though we've never seen a gem on Lion, the theory of Lion being a gem is a long standing one. But, since there was a lack of evidence, fans dismissed it. However, there's definitely something magical about him, and he definitely has a mysterious connection to Rose. So where did he come from? Check out a compilation of the evidence that Lion might be Pink Diamond's pearl, at the link below.