Hi...I just opened the image in another window and then enlarged it to 200% and I think it's fair to say that it isn't beech, unless it's some bizarre sub species that I've never heard of....as for what it is, well your guess is as good as mine. It's not unlike iroko, but with a few thousand commercially available timbers world-wide to choose from, and without a good close-up of end grain, then there's little way of telling.
As for the goblet, I like it a lot, especially for the proportions and the decoration/texture. My only reservation is the contrasting texture on the loose rings; it seems slightly at odds with the rest of the piece.
Les