White Fritillaria, also known as Pearl Fritillaria, actually refers to pearl shells. After polishing, this material will produce a pearl-like luster. When we usually wear white Fritillaria jewelry, we must be careful not to let it be rubbed by sharp and hard substances, and not to let it touch soap, perfume, cosmetics and other things. Cat's eye, namely "cat's eye", "cat's eye" and "cat essence". Opal, also known as oriental cat's eye, is a rare and precious variety in jewelry. Because the light phenomenon of opal is as flexible and bright as cat's eye, it can change with the intensity of light, so it is named. This optical effect is called "cat's eye effect". Opal is a kind of chrysoberyl in mineralogy and belongs to the chrysoberyl family.

Opal has many colors, such as honey yellow, brownish yellow, wine yellow, brownish yellow, yellowish green, yellowish brown, grayish green and so on, among which honey yellow is the most precious. Transparent to translucent. The glass is greasy and shiny. The refractive index is 1.746- 1.755, and the birefringence is 0.008-0.0 10. Dichroism is obvious, the dispersion is 0.0 15, and it is not isotropic. The hardness is 8.5, and the density is 3.71-3.75g/cm3. Shell fracture. The difference between cat's eyes like opal and artificial cat's eyes. Tourmaline, beryl, apatite, Yingshi, kyanite, etc., which can produce cat's eye effect in nature, are not as precious as gold-green cat's eyes.