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In gemology, the concept of “refractive index” is often mentioned, and in some places it is called “refractive index”. The refractive index is an important parameter reflecting the optical properties of gems.

When light propagates from one medium to another, reflection and refraction occur at the interface between the two media. The ratio of the sine of the incident angle and the sine of the refraction angle is a fixed value. The fixed value is the refractive index of the second medium relative to the first medium. If the first medium is vacuum (or air), the fixed value is the absolute refractive index of the second medium, which is generally referred to as the refractive index Both are absolute refractive index, which is the law of refraction.

The refractive index of the medium is related to its composition and structure. In treasure studies, the refractive index of gems has a relatively fixed value, which is an important parameter for determining gem species. When appraising gems, professionals often first measure the refractive index of the gems, and then combine other gemological characteristics to determine the species of gems.

Umuman gapiradigan, a heterogeneous gemstone has a maximum refractive index and a minimum refractive index. The difference between the two is called the maximum birefringence; the homogeneous gemstone has only one refractive index.

The refractive index has a certain effect on the luster of a gem. Umuman gapiradigan, the greater the refractive index of a gem, the stronger its luster. Masalan, the luster of a diamond is diamond luster, indicating that its refractive index is very large. Rely on luster to select diamonds.

A radiometer is an instrument used to measure the refractive index of gems. When measuring the refractive index of a gemstone, it is generally required that the gemstone have at least a certain smooth facet or arc. For faceted gemstones, the refractive index and birefringence of the gemstone can be measured by faceting; for cambered gemstones, the approximate refractive index of the gemstone can be measured by spot measurement.

 

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