Yes, Agate has Heterochromia Iridum (multi-colored irises).
Uhh, I don't really know what else to say here other then the next time you see Eyris, she might have a different design. I really have to redesign her (Mostly her color-scheme). ^^'
((Black and White Banded Agate and Eyris Pearl belong to me.))
((Steven Universe belongs to Rebecca Sugar.))
((This was sketched in a 0.7mm mechanical pencil and done in Adobe Photoshop CC.))