1. Citrine, a variety of quartz, is a silica mineral like quartz.
2. The color of topaz ranges from yellow to light brown, which is easily confused with topaz.
3. The yellow in the yellow crystal is due to the fact that it contains water ferric oxide.
4. Natural topaz is rare, and there are few places of origin. Only Brazil and Madagascar produce a certain amount of high-quality products.
5. People often heat amethyst and smoke crystal to change its color into the appearance of yellow crystal, or even fake topaz.
6. Topaz has complete joints, topaz has no joints, and the lowest refractive index of topaz is 1.61, while the highest refractive index of topaz is 1.55.
