From what I read natural colour change Andesine is pretty rare and suspicion is that "natural" in a lot of cases means treated by irradiation etc. I have seen alleged colour cahnge Andesine over a carat on sale in the US for less than $100.
Baby it's cold outside!
There was an enormous hoo-haa in the US about andesine a few years ago. Most andesine is irradiated as Mr Jones has said. It's not an expensive stone and many don't have a great colour change. I bought about 50 to look at and ended up keeping 1.
I bought a colour change andesine from the old Gemstv a few years back( it was with the usual hype about rare rare rare and I got sucked in like you do ) the stone in daylight is a very dark green with flashes of almost neon green which I like, but to see any change of colour I have to shine a torch on it then it goes a reddish colour ,though as I dont keep a torch handy when I wear it I just pop it on when I want to wear a green stoned ring I do like the design and the cushion cut so I'm not unhappy with it I dont think its what its all hyped up to be thats all.
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