Transparency can be used to understand the quality of gems. The higher the transparency of the same gem, the more precious it is. Transparency can also be used to distinguish gems with similar colors but different kinds.

2, look at the luster:

The luster of gem is the basis of naked eye identification, and the luster is determined by refractive index and smoothness of polished surface. The stronger the luster of a gem, the higher the refractive index. The refractive index of semi-diamond polished gemstones belongs to the high refractive index range on the refractometer scale, while the refractive index of glass polished gemstones is in the friction range, while the refractive index of semi-polished gemstones is in the lower range.

3. Look at the contents:

Observing the characteristics of inclusions in transparent gemstones with a magnifying glass of 10 times is the most reliable method to distinguish natural and artificial products. The inclusions in natural gemstones can be solid, liquid and gas. Most of the inclusions in artificial gem have bubbles, and the solid inclusions with swirl marks are inclusions in synthetic gemstones.

4. Look at the deviation:

Only diamonds, artificial cubic zirconia, zircon, rutile, garnet, cassiterite and so on. Can be seen with the naked eye. Gems have their own dispersion, and the degree of dispersion is different, and the color and clarity of decomposition are also different. The color integrity of the decomposition spectrum of gemstones is directly proportional to the dispersion of gemstones.