The name Citrine is due to its color lime-yellow (from the Latin for “citrus”). The Citrine color varies from pale yellow to golden brown and because of that it can be confused for Imperial Topaz. Natural citrines are rare. Most of the Citrines found in the market are in fact Amethyst or Smoke Quartz. Brazilian Amethysts become light yellow at 470ºC and dark yellow from 550ºC to 560ºC.