Citrine is a type of quartz that resembles topaz quartz, but it is incorrect to call it so. It is very available and durable and is sometimes made by heating Amethyst from its characteristic purple-violet color to the yellow color of Citrine. Citrine itself can be anywhere from yellow to gold, to an orange-brown.
Most Citrine is from Brazil, and is thought to give protection from snake venom and evil thoughts. While Citrine may be durable, it is still advised to keep it from heat and intense light.