Nice German handmades. I agree with the symmetry.
I'm wondering if the first isn't actually transparent blue over yellow. Making it look green from most angles.
Always hard to compare an in-hand opinion to pics on a screen, but for my 2 cents it looks legit to me.
But like I said, somebody might know otherwise based on their personal experience with the marble. Good luck at the show.
Definitely hand made German, but there are some intricacies with types that don't fall into a definite category. I never quite understood "transparent Indian" compared to a banded transparent vs. Coreless swirl. Might be a regional thing?
Not sure if that's an Alley? Might need some more views. Blue almost looks transparent. The one to its left (with yellow) in the first pic also looks worth another view
Foreign wirepull, most likely velligglas (sp). what makes this look more appealing is the "wire" follows more of a spiral pattern compared to the more common random pattern. A hardcore collector might see the value in the pattern compared to your average wirepull.
Good question, I'm curious as well. Aventurine in German handmades is few and far between. Most likely incidental. Your example above is excellent. What's the size?