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
HMS Amethyst (1903) tow on her way to the breaker's at Milford Haven, the tow parted in a gale and heavy seas and the New Quay lifeboat took off seven of "Amethyst"'s eight crew; the captain was taken off two days later in the continuing storm by Aberystwyth lifeboat. HMS Amethyst (1903) HMS "Amethyst" was a third-class protected cruiser of the "Topaze" class of the Royal Navy. She was launched in 1903, served during World War I at the Dardanelles and Gallipoli, in the Mediterranean and the South Atlantic. She was sold for scrap in 1920. She was laid down in January 1903