Synthetic faceted rubies show dichroism in the direction of the gemstone's countertop, while natural faceted rubies are visible in the waistline.
Synthetic rubies are uniform in color, have few internal defects, are clean, have large blocks, and occasionally have curved growth lines;
The synthetic ruby ​​inclusions occasionally have a single round, teardrop-shaped bubble;
The synthetic ruby ​​has a stronger red color than the natural ruby ​​under the UV light;
Natural ruby ​​and synthetic ruby ​​are different in the direction of picking in the gemstone crystal material during processing, so the display direction of dichroism is also different.
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