Amethyst is crystalline quartz in colors ranging from pale lilac to deep reddish purple. Amethyst can even have reddish or bluish hues. Amethyst crystals can change color due to heat or ultraviolet (UV) radiation. When heated to temperatures above 300 degrees Celsius, amethyst loses its purple color and often turns yellow, orange, or brown. These 2 cut bases are in the reddish and orange range.
