Jewelry magnifying glass is one of the most commonly used gem detection tools, which has the advantages of simple structure, convenient operation and portability. Due to the special requirements of jewelry inspection, the production of this magnifying glass is also strict, and its optical quality can not be lower than that of low-grade camera lenses. So pay attention to the following aspects when purchasing: 1. The aperture of the magnifying glass is about 18 mm. Observing a plane through a lens, the center and edge should be equally clear; When observing a straight line, the thickness of the edge and the center should be the same. 3. When observing black characters on a white background through the lens, there should be no yellow or blue halo at the edge of the black characters.

Jewelry magnifying glass is one of the most commonly used gem detection tools, which has the advantages of simple structure, convenient operation and portability. Due to the special requirements of jewelry inspection, the production of this magnifying glass is also strict, and its optical quality can not be lower than that of low-grade camera lenses. So pay attention to the following aspects when purchasing: 1. The aperture of the magnifying glass is about 18 mm. Step 2: Observe through the lens.