Citrine is the yellow and orange variety of quartz, SiO2. It is used as the birthstone for November. Most of our citrine comes from Brazil. Citrine wears very well with a hardness of 7 on the mohs scale. Its refractive index is 1.544 to 1.553 and the crystal system is trigonal. To view our finished citrine jewelry, click here. Choose your preferred shape from the table below.