Citrine is a variety of quartz whose color ranges from a pale yellow/green to brown (cognac citrine.) Natural citrines are rare; most commercial citrines are heat-treated amethysts or smoky quartzes. Citrine has ferric impurities, and is rarely found naturally. 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.
Named from the French word for lemon, "citron" since citrine has a juicy lemon color. In ancient times, citrine was carried as a protection against snake venom and evil thoughts. It is one of the most affordable of all the earth-toned gemstones and is the alternate birthstone for November.
Citrine was one of the stones used in the breastplate of High Priests. In ancient times, it was carried as a protection against the plague, skin problems, snake bites, and evil thoughts. Known as "The Merchant's Stone," Citrine is said to bring prosperity when placed in a cash register.
Here is a photo of a 14kt gold ring with cognac citrine:
Check out more jewelry with citrine.