what is citrine used for
Citrine is the yellow to brownish-red variety of the mineral Quartz. It is a widely used as a gemstone, and after Amethyst it is the most popular Quartz gem. Most Citrine is formed by heat treating purple Amethyst. Citrine may also be produced by heat-treating Smoky Quartz from certain localities.atural light yellow Citrine is often called Lemon Quartz on the gemstone market. Sometimes Citrine has a smoky hue to it, and can be borderlined between Citrine and Smoky Quartz, with either definition being correct. For additional information, see the gemstone section on Citrine.