The difference between rubies and other similar gemstones:
(1) The difference between red garnet
Garnet is homogeneous and has no pleochroism, while 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 with red spinel
The spinel is a homogeneous body with no pleochroism. The refractive index is lower than that of the ruby. The spinel has a beaded octahedral negative crystal.
(3) the difference with red tourmaline
The tourmaline has a more pronounced pleochroism, and the faceted gemstones are visible in the proper direction and the facets are ghosted.
(4) the difference with andalusite
Andalusite has strong pleochroism visible to the naked eye. The colors are brown yellow green, brown orange and maroon. The short-wave ultraviolet light has a to medium-green and yellow-green fluorescence, while the ruby ​​has no to medium red fluorescence. Ruby has a distinct Cr absorption line in the red zone.
(5) the difference with 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, a clear ridgeline, a small glass density, and a light handkerchief.
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