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 Incident sail for Hong Kong. Next day the cruiser (flying the flag of the Flag Officer Second in Command Far East Fleet) and destroyer took over as escort and proceeded to Hong Kong. "Concord" was sent to Japan after being sworn to secrecy. "Amethyst" subsequently received a message of congratulations from King George VI: Future Governor of Hong Kong Edward Youde was on the British Embassy Staff at Nanking. At great personal risk he penetrated the Chinese Communist lines in an attempt to negotiate the release of "Amethyst" with the PLA. His negotiations came to naught. Youde later was made a