Amethyst is a member of the Quartz family and is considered to be a semi-precious gemstone. Relatively abundant in nature, clear, large, natural stones are available. Deep colors are the most valuable, particularly a rich purple with rose flashes. The NIGERIAN deep purple with red and blue flash commands the highest prices. Amethyst often exhibits the phenomena of color shift – sometimes called color change in the marketplace.
Bluish purple through purple to reddish purple. The color agent of Amethyst is iron.
Transparent to translucent. Amethyst is a Type II gemstone and is usually included.
Phenomena: Amethyst often exhibits the phenomena of color shift and will show a change in hue under different lighting conditions, appearing bluish purple under daylight and red through reddish purple under incandescent light.