Black sapphire cabochon
Black sapphire cabochon 9.14 ct
Cabochon black sapphire of natural origin from Thailand weighing 9.14 carats. The highlight of this sapphire is the star effect, which appears as a 6-pointed star on the surface of the cabochon when exposed to a ray of light. The stone is unheated, not refined. The zoning of the corundum is interesting. The cabochon is oval. The video shows how the asterism (star) effect looks like in this sapphire.