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
Yangtse Incident: The Story of H.M.S. Amethyst Yangtse Incident: The Story of H.M.S. Amethyst Yangtse Incident: The Story of H.M.S. Amethyst (1957) is a British war film that tells the story of the British sloop caught up in the Chinese Civil War and involved in the 1949 Yangtze Incident. It was based upon the book written by Lawrence Earl. The film was known in the US by the alternative titles Battle Hell, "Escape of the Amethyst", "Their Greatest Glory" and "Yangtze Incident". Non-English language titles include the direct German translation of "Yangtse-Zwischenfall", and "Commando sur le Yang-Tse" in France. In Belgium it was known as "Feu sur