cheap gold plated jewelry Identification of Red and Sapphire

1. Distinguishing ruby ​​and natural similar gems

(1) Red spinel. The red spinel has uniform color and is generally colorless; no dichroism, no four bright and four dark phenomena under a polarized lens; it can contain octahedral negative crystals and no silky inclusions.

(2) Magnesia garnet. The red magnesia garnet is uniform in color; there is no fluorescence reaction; the brown component in the color increases under strong light; there is no dichroism; two sets of nearly vertical needle-shaped inclusions can be seen inside.

(3) Pink tourmaline. The color of tourmaline is pink-rose red, no positive red; pleochroism is more obvious than ruby, and more obvious color changes can be felt when the tourmaline is rotated; the back facet ghosting of the gem under 10X magnifying glass is obvious; it has a strong adsorption effect, If you leave it with the red gem for a long time, the tourmaline surface will have the most dust.

2. Identification of Sapphire and Naturally Similar Gems

(1) Blue spinel. The blue spinel has a uniform color and a slightly grayish hue; there is no dichroism; there are many gas-liquid inclusions and small octahedral spinel inclusions in the crystal.

(2) Blue tourmaline. Blue tourmalines are mostly greenish blue; dichroism is very obvious; there are many cracks and hollow tubular gas-liquid inclusions inside.

It should be said that synthetic ruby ​​and synthetic sapphire are similar to natural gems in hardness, relative density, refractive index, birefringence and absorption spectrum. It is relatively difficult to distinguish them, usually mainly based on the difference in content.

 

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