Citrine is a variety of quartz ranging in colors of yellow, yellow-brown, orange, dark orange-brown, reddish-brown. Citrine crystals can form together with amethyst, or smoky quartz, to form a bi-colored quartz called ametrine.
Almost all citrine that is available on the market today is heat-treated amethyst. Natural citrine is pale yellow to pale orange, much lighter than the heat-treated material which is dark orange-brown to reddish-brown. All of the heat-treated material has a red tint, while natural citrine does not. Some amethyst deposits have been found where the amethyst was changed naturally by high temperatures to brown citrine.
Most citrine comes from Brazil, 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 inexpensive low grade amethyst is heated at high temperatures to produce the popular orange, reddish and sherry colored citrine. Darker colors are considered more valuable, including the medium golden orange and dark sherry-colors.
Citrine may be mistaken for the more expensive orangish-yellow topaz and, at times, may be sold as topaz by dishonest gemstone vendors. Due to this, citrine buyers are sometimes suspicious of any citrine and think it may actually be fake topaz.
Citrine is believed to help the heart, kidney, digestive tract, liver and muscles. It promotes creativity, helps personal clarity and eliminates self-destructive tendencies.