It's a silver dot in the glass. I initially thought it was a scratch. The uneven top layer is killing me now that I know it's there. I'm still well into the return period, but I know someone in need of a phone and I've decided to donate it. She is using my old Nexus 4 8GB and has been nonstop complaining about how she doesn't have any space for her videos and photos.
I am hugely disappointed in the way it sounds in my car over bluetooth also, and that is a MUCH bigger problem for me. I am so happy I didn't sell my 5S in a rush - BT audio is a huge deal to me.
It's a nice phone guys, but it just has that "you get what you pay for" feel to it. I see no reason to get this phone over a Nexus 5, even with the extra space.