Citrine is a variety of quartz whose color ranges from a pale yellow to brown due to ferric impurities. Natural citrines are rare; most commercial citrines are heat-treated amethysts or smoky quartzes. However, a heat-treated amethyst will have small lines in the crystal, as opposed to a natural citrine’s cloudy or smokey appearance. It is nearly impossible to tell cut citrine from yellow topazvisually, but they differ in hardness.Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul. The name is derived from Latin citrina which means “yellow” and is also the origin of the word “citron.” Sometimes citrine and amethyst can be found together in the same crystal, which is then referred to as ametrine.

Reference: Wikipedia

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