Star sapphire stone, 11.39 carats

Technical details: Type: Star Sapphire Weight: 11.39 carats Dimensions (mm): 12.93x10.81x6.83 Shape: Cabochon Color: Black and gold Clarity: Eye clean Transparency: Transparent Hardness: 9.0 Treatment: Untreated Origin: Thailand Certification: Certificate from Saudi Laboratory (MT) - website (www.mtgl.com.sa) The Star Sapphire is a rare type of sapphire that shows a unique optical phenomenon known as "asterism." This phenomenon appears as a bright star with six rays (and sometimes twelve) that shows and moves on the polished surface of the cabochon-shaped stone when light falls on it. This effect is attributed to the presence of fine needle-like inclusions of rutile arranged in a crossed pattern inside the sapphire crystal. The star sapphire is characterized by the beauty of its blue color, but it can also appear in other sapphire colors such as gray, black, or pink, with the shining star.