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Ametrines are a natural variety of quartz, and a mix of Citrine and Amethyst and the colour of the zones visible within ametrine are due to differing oxidation states of iron within the crystal.
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Ametrines are a natural variety of quartz, and a mix of Citrine and Amethyst and the colour of the zones visible within ametrine are due to differing oxidation states of iron within the crystal.