This is the immense earthly beauty of borosiicate glass right here! Those amber purples are the best, sparkly and so honey like. Really a neat marble! It is signed but unfortunately I haven't figured out who the artist is - I think the sig is 'FJH III 2003', and I feel like I should know whose sig this is (see last pic), but it hasn't come to me yet. If it does, I will update this listing.