The topaz for the watery aluminosilicate mineral, chemistry molecular formula is Al2[SiO4](F, OH)2, in the ingredient F and the (OH) ratio change does not decide. The crystal is the orthogonal (trapezius) crystal system's island shape structure silicate mineral, the shape assumes the trapezius columnar, the cylinder often has the longirudinal striation, the aggregate shape for columnar, granular, massive. The color is the achromatic color, light yellow, deep yellow, the brown, sky blue, flesh color, red, light green and brown and so on. Glassy luster, transparently to translucent. Index of refraction 1.619-1.627, double refraction rate 0.008-0.010, chromatic dispersion 0.014. The polychromy is clear. Degree of hardness 8, density 3.49-3.57 grams/cubic centimeters. The cleavage growth, the nature is crisp. In long, under shortwave ultraviolet ray's illumination, each kind of color request handkerchief stone demonstration different fluorescence. Based on the color, may divide into the liquor yellow, the achromatic color, the blue color, the green, the red request handkerchief stone generally. And the superior deep yellow is most precious, the color more yellow is better. Next is the blue color, the green and red.

In the western, the topaz jewelry may wear as the charm amulet, can exorcise evil spirits to exorcism, makes one eliminate sorrowfully, enhancement confidence. With holds the handkerchief stone the powder to soak the liquor, then may treat asthma, losing sleep, the burn and the hemorrhage and so on sickness. Our country has the glorious history to the topaz understanding and the use. The topaz is one kind of color enchanting, attractive the cheap gemstone jewelry, the depth is liked the people. Internationally many countries decide the topaz are  November birthstone, is the friendship, the friendship and the friendly affection symbol

The purchases secret of topaz jewelry selects

(1) to select and purchase the topaz first to pay great attention the color, the bright pure liquor yellow, the orange topaz is high quality goods.

(2) the gemstoen jewelry should the standard be bright, side cannot have the crack, the slight defect or collapses.

(3) should inquire that the color is natural or radiates changes countenance