If the clear is glass, then it appears to be a fried marble. Glass cracked by extreme cold and heat applied alternately. But that's very large for the typical fried marble. That's why I'm wondering if might actually be plastic, not glass at all.
The blue marble is two inches??!! It could be a slag or transitional. At that size, I'm thinking of only two choice. MFC made large slags, but I don't know of they made one in that light of a shade of blue, and I don't know if they ever would have had a pontil like that. So I am not leaning toward MFC.
I'm actually leaning toward contemporary because I just don't recognize such a large handgathered marble as being vintage if it doesn't fall into the MFC zone.