Natural citrine is hard to find, and most of the citrines on the market are actually heat-treated natural amethyst. Natural citrine, however, is a good substitute for yellow sapphire and topaz. Citrines resemble yellow sapphire, and are often sold as topaz, although topaz usually has a richer color. Citrine comes from Brazil, Madagascar, Uruguay and France. The best gems come from Brazil. One who wears citrine will have undisturbed sleep.   If you know of information that is not listed here, or if you would like to help update our listings, please e-mail us at: