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 and unwounded men who had been sent ashore. He assumed command of the ship that day. During the next few days "Amethyst" moved several times, but each time she got under way the batteries opened fire at her and the ship was forced to anchor, finally finishing up off Fu Te Wei. On 21 April a signal was received: ""HM ships" London "and" Black Swan "are moving up river to escort the" Amethyst "down stream. Be ready to move."" The cruiser and the frigate (ex-sloop and "Amethyst"s sister ship) were heavily shelled as they attempted to help "Amethyst" and retreated