Why do amethysts lose their color in sunlight?

The reason why amethyst loses its colour in sunlight is due in no small part to what impurity in the S i O X 2 crystal structure gives the vivid purple and violet tones of amethyst. read more

The sun can fade certain crystals, such as Amethyst, Rose Quartz, Celestite, Smoky Quartz, and others. But it also could be that you and your Amethyst wand were channeling higher energies during use, that flowed through it and altered the color. read more

"Desert amethyst glass" acquires its color from a color center, as do the colors of the natural gemstones amethyst, smoky quartz, and blue and orange topaz. Many other materials, both natural and man-made, can be irradiated to produce color centers, including irradiated blue, yellow, and green diamonds. read more