View Full Version : changing colors

13-02-2004, 14:54
I have a smokey quartz crystal skull that seems a LOT darker today than it did yesterday. I know amethyst can fade in the sun, but does anyone know if smokey quartz can change from exposure to the sun or cold temperatures?


14-02-2004, 00:05
Per my copy of Walter Schumann's Gemstones of the World: "Pales when heated to 572-752F/300-400C." That's commercial heat treating, obviously. No mention made of sensitivity to sunlight or chemicals.


14-02-2004, 00:59
Thanks !! I wonder if the paling is permanent , or if it changes back to the original color as it cools down. I don't think I will be putting it in the oven to find out.