I'm pretty sure it's a piece of metal or plastic cast in clear resin on top of black resin (double poured), Mike...
Yes, I agree with you on that, however, I would bring the attention to the colour Vs effect of the bird on the clear resin...!
I would like also to see a side pic of this piece, as
some of the visual effect of the shown pic has to do with the "curvature" of the clear resin (looks like glass to me...???) when it was turned. I white or a silver type bird embedded in the clear resin, will not produce that visual effect.
There would be needed some additional info about the material this bird was embedded on, if glass, the whole things is a different issue...!
PS: After I saw the extra pic of this piece, I realize that my first observation above was incorrect as the top is flat is not curved/turned as I though, my apologies...!
Cheers
George