Hello and welcome.

What is it? I can't make it out.
Is it black? Is it clear? Is it a plate or a stand-up piece?
It appears to be decorated with dichroic glass - the sparkly multicoloured bits, and that is fairly recent, so I think I'm safe in saying it is not any antique.
Thanks for posting nice big images directly to the board, it is very much appreciated, but a very plain background would help us to help you.
