Topaz can be divided into light yellow, golden yellow, orange yellow, brown yellow, champagne color, lemon color and other colors. One of the darker colors, champagne or orange, is usually naturally output. The price is the most expensive. Many topaz in the market are made of amethyst after heating and fading. The color is light, there is no glamorous feeling, and the tone is a bit thin. Although they all come from the right time, we think that the value of this topaz is not as high as that of natural topaz, so relevant experts recommend some identification methods for crystal lovers.

1, fracture identification, the pattern of glass fracture is familiar to everyone, and it is a smooth and curved dent like a shell; Crystal is an ore, the texture of the stone can be seen at the fracture, and the crystal is a crystal, and there will be no traces like glass on the cross section.

2. Thermal conductivity detection: set the thermal conductivity meter to 4 grids to detect gems. Rock crystals can rise to 2 grids of yellow, and when the area is large, they will rise to 1 grid of yellow, while pseudocrystals will not rise.

3. According to the handle, crystals are all crystals, which have fast heat transfer, while glass is amorphous and slow heat transfer. Therefore, holding the crystal will make you feel cold, and after wearing it for a short time, it will synchronize with your body temperature; And glass has a sense of temperature.

4. Hardness measurement: The hardness of rock crystal is 7, while the hardness of glass is only 5. So when testing, anything with hardness greater than 5 may scratch the glass.

5. The observation of inclusions shows that most synthetic crystals are pure, so big and look perfect; Crystals generally have "defects" such as cotton and cracks. Natural products are pure, but rare, and things are rare, which is reflected in the price. The natural products of topaz with the same color clarity are much larger than synthetic crystals. Many topaz in the domestic market are made of amethyst after heating and fading. For the lighter topaz, some jewelers will also enhance the color of the gem by irradiation to make it look more gorgeous. This kind of topaz is widely accepted by the public because of its large quantity, low price and no discoloration at room temperature.