Citrine - the birthstone for November. Citrine is the birthstone for November and the traditional anniversary gemstone for the 13th year of marriage. Its name comes from an old French word for lemon -- "citrine". A variety of quartz and the "sister stone" to the purple variety known as Amethyst, citrine comes in a wide range of colors. Some believe that some citrine may have actually begun as amethyst, but that nearby molten rock changed it to the yellow form of quartz. Mined mainly in Brazil, but also found in Bolivia, citrines come in vivid yellows and oranges, and also the unusual and extremely popular "madeira red." (Citrines that are pale yellow or yellowish-brown are often mistaken for yellow or golden topaz.) Natural citrine can also be found in the Ural Mountains of Russia, in Dauphine, France, and in Madagascar