Ametrine is a naturally occurring variety of quartz that combines two distinct colors: the purple of amethyst and the golden-yellow of citrine—within the same crystal. This stunning fusion creates a striking, often seamless gradient of color, making each gemstone unique.
The color zoning is caused by differences in oxidation states of iron within the crystal, influenced by temperature variations during formation. Natural ametrine is quite rare, and the contrast between colors can range from subtle to vivid.
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