View Full Version : changing colors
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?
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.
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.