Amethyst even if the iron concentration is low. Natural amethyst is dichroic in reddish violet and bluish violet, but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine, but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine. Amethyst can fade in tone if overexposed to light sources and can be artificially darkened with adequate irradiation. Amethyst was used as a gemstone by the ancient Egyptians and was largely employed in antiquity for intaglio engraved gems. The largest Ancient Egyptian amethyst mines are located at Wadi el-Hudi and those mines may be the
Amethyst, Princess of Gemworld limited series (identified by DC Comics as a "maxi-series") establishes Gemworld, Amethyst's identity, and introduces several of her recurring villains. The limited series was followed by a 1984 annual and a sixteen-issue ongoing series. The ongoing series was followed by the 1986 "Amethyst Special" one-shot and a four-issue limited series that ended the character's adventures (pencilled by Esteban Maroto). There was also a one-shot with Superman in "DC Comics Presents" #63 (Nov. 1983). The character re-emerged in 2005 after 18 years of sporadic appearances, in the "Infinite Crisis" mini-series. In June 2012 it was announced that Amethyst would make her