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Amethyst Nice Gemstone jewellery Ring- Solid Silver Purple Amethyst Ring – Amethyst Ring, Solid Silver, Purple, fine jewellery, Gemstones ring, labour day gift, engagement ring, nice seller, Ring fine jewellery, Amethyst Nice Gemstone , Ring gift for good **** Some amethysts pale almost to colourlessness in daylight. The reason for this has not yet been discovered, but it is possible to re-colour them by means of radium radiation. The fact that these stones can lose their colour makes it obvio us that amethyst jewellery should not be worn while sunbathing, in a solarium or in a discotheque with black light. Sudden changes of temperature can also be harmful to the stone.