Maru's eyes are a bit lighter, not really pure black, you can see her little pupil in there. I personally think you DID find a gem..But it is a normal gem, and there is nothing wrong with having a few beautiful normals! The eyes on yours are lighter than I've normally seen, but I don't know if they scream morph at me or anything!

But if you ever have a need to breed a normal to something, at least you will be using one of the prettiest normals I've seen!