Can't tell from the photos Rose, but I would try my UV light on it.
Thanks Lustrousstone -- but I did, and it has no glow. I know it looks like it (another reason I bought it) but I did try it already. So No glow. I do not know how to describe the color. It is not yellow, kinda a

custard color

but certainly no glow even a little bit.
Still a mystery as why the mark is on the inside? :huh: