Hi Glen, It has a bright red coating at the base sprayed over an amber base glass, not irridised at all. I thought it was amberina when I first looked at it, then got it home and noticed a couple of little scratches in the red showed through to the amber. So I took it out of the lot, thought it was probably rubbish, and just put it on the side until I could find out a bit more!
I'll take a pic later, and pop it on here.