About Citrine :-Citrine is the yellow to orange variety of Quartz. Natural Citrine is not common; most Citrine on the gem market is produced by heat treating Amethyst and Smoky Quartz. It takes a relatively low temperature to change the color light to golden yellow, and heating to higher temperatures will give the stone a darker yellow to brownish-red color. The name Citrine is derived from the citron fruit, a yellow fruit similar to the lemon. Brazil is the largest producer of Citrine. Other sources are Argentina, Madagascar, Zaire, Namibia, Spain, and Russia. Virtually all gem Citrine is not naturally colored, but rather colored from heat treatment of Amethyst. Heating Amethyst at about 750 degrees Fahrenheit will produce a mild yellow color, and heating to about 1700 degrees products deep orange to reddish colors. Most heat treated Citrine has a reddish tint.