The first photo is with a 2700K LED flashlight, the second is with a 5000K LED flashlight. In real life, the yellow light really does look exactly like that - very red-pink. For the second photo, though, the stone is definitely less purple and more blue in real life.
As for definitive chemical testing, I don't believe I've heard of anyone sending this off for things like LIBS or LA-ICP. But I can take this piece to Tucson this year and see what people think
Post subject: Re: Color change Amethyst ? Myth or fact ?
Posted: Wed Sep 28, 2022 4:21 pm
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Joined: Tue Apr 05, 2016 7:58 pm Posts: 1424 Location: San Marcos, CA
Does anyone think that if a stone were faceted from this type of quartz material and submitted to a lab for gem identification, that it may be given a color-change or color-shifting call?
All intensely colored amethyst does this to some extent in my experience, as do rhodolites approaching this color range or pretty much anything in this magneta-purple-blue color range. This phenomenon seems to be occasionally/cyclically noticed and used in marketing. The zoning phenomenon (which can look like zones of almost pure blue) can be seen in nigerian amethyst as well. I suspect it is partially zoning and partially twinning since intensely colored amethyst is also pleochroic between reddish purple and violet blue, so it could just be a zone oriented favorable to blue amongst zines oriented favorable to red-purple. As I recall they did seem to swap around eith different orientations but I was plating with this material a while back. There is a distinct violet-blue color phenomenon evident in multi-treated quartz from some mines in brazil ('blueberry quartz') which might play a role. I don't know if that material has been thoroughly studied.
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