Often mistaken for topaz, citrine is a variety of quartz found mostly in Brazil. Its name comes from the French word for "lemon," a reference to its soft yellow to golden-brown color caused by ferric iron. The discovery in Brazil in 1979 of a unique deposit of citrine in conjunction with amethyst resulted in a new gemstone called ametrine. Though they are sister quartzes, the cause of their combined occurrence is still a mystery. As a healing stone, citrine is associated with relaxation of mind and body and can be helpful to the digestive system.