For your consideration is this 5/8" swirl marble, with opaque white, and dark brown and blue swirls. The fine dark lines are actually transparent, and possibly clear. The structure is intriguing, in that the blue seems to come from the interior, while the dark brown seems to be only on the surface. Not sure if the white is the base glass, or is the transparent? I don't know who made it. Could be Jabo, Heaton, Ravenswood, Alley, or even CAC. It's in very nice condition. Please look over my photos, and evaluate the condition for yourself. And hopefully, you will be able to identify it, as well. Ask any questions you may have. Shipping via USPS Ground Advantage will cost $5.00. Thanks for stopping by. I don't use A. I. I prefer to describe my items in my own language.