Citrine is a semi-precious quartz variety that, much like topaz, occurs very rarely in nature. Most of the Citrine on the market today are the result of heat treating amethyst into its warm golden colors. Because of the abundance of Quartz and its varieties Citrine is often cut into large freeform pieces and can also be available in bicolored pieces with Amethyst colors known as Ametrine. Citrine is one of the birthstones for November and is a common 1st and 13th year anniversary gift.