Okay - I know it is an ashtray and I always said I wouldn't buy them..

.. But it was too gorgeous a piece of glass to resist. The shop called it a bowl LOL
I really cannot work it out. It looks really deep turquoise blue around the top but I cannot see a layer of that colour - it looks almost clear over the rest of it - amber inside, but the colour just seems to really intensify at the top.
Firstly is it Murano? I am a Murano newbie!
it seems to have good age wear - or it has had a very hard life.
any idea of maker? age?
any and all info welcomed
thanks
JAK