Ruby is a red, pink corundum that is a kind of corundum. Its main component is alumina (Al2O3) and red is from chromium (Cr). Natural rubies are rare and rare, but man-made rubies are not too difficult, so industrial rubies are artificial. The difference between ruby ​​and other similar gemstones is as follows:

(1) The difference with red garnet: garnet is homogeneous, no pleochroism, and ruby ​​chromaticity is obvious under UV light, ruby ​​has red fluorescence, and garnet is inert. When magnified, the interior of the garnet is cleaner, and the gas-liquid inclusions and solid inclusions in the ruby ​​are abundant.

(2) The difference from the red spinel: the spinel is a homogeneous body, and the polychromatic refractive index is lower than that of the ruby. When the magnifying inspection is performed, the spinel has a bead-like octahedral negative crystal.

(3) The difference with the red tourmaline: the tourmaline has more obvious pleochroism, and the faceted gemstone is visible in the proper direction and the facet is ghosted.

(4) The difference with andalusite: The andalusite has strong pleochroism visible to the naked eye. The color is brown yellow green, brown orange and maroon. The color of the short-wave ultraviolet light has a tough green color and yellow-green fluorescence. The ruby ​​has no to medium red fluorescence, and the ruby ​​has a distinct Cr absorption line in the red zone.

(5) The difference between red glass and red glass: red glass is homogeneous and has no pleochroism. It can be enlarged to check the phenomenon of bubbles and vortex in the red glass. It has a typical shell-like fracture, and the ridge line has obvious glass density. Light feeling.

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