Citrine

Citrine is a semi-precious stone as it's one of the most common forms of quartz. It's a variety of quartz crystal or cluster with a color that ranges from yellow or orange to brown. The most of citrines are heat-treated amethysts or smoky quartzes. It takes a relatively low temperature to change the color light to golden yellow; heating to higher temperatures gives the stone a darker yellow to brownish-red color. The deeper colored citrines are the most valuable. All of the heat-treated material has a red tint, while natural citrine does not.

Citrine has ferric impurities, Natural citrines and Citrine deposits are very rare;This stone gets its name from the French word citron which means lemon.

Citrine gemstone has been used formerly by Ancient Romans to make jewelry.

Most citrine comes from Brazil and Brazil is the leading producer of citrine, with much of its production coming from the state of Rio Grande do Sul, but almost all of the Brazilian material is heat-treated amethyst. Natural citrine can also be found in the Ural Mountains of Russia, in Dauphine, France, and in Madagascar.

The hardness of citrine gemstone according to the Mohs scale is: 7.