A pair of star sapphire, 11.69 carats

Technical details: Type: Star Sapphire Weight: 11.694 carats Dimensions (mm): 11.12x8.16x5.19 (average) Shape: Cabochon Color: Blue Clarity: Pure to the eye Transparency: Transparent Hardness: 9.0 Treatment: Untreated Origin: Unknown 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 (sometimes twelve) that appears and moves on the polished surface of the cabochon-shaped stone when light falls on it. This effect is attributed to fine needle-like inclusions of rutile arranged in a cross pattern inside the sapphire crystal. The star sapphire is characterized by its beautiful blue color, but it can also appear in other sapphire colors such as gray, black, or pink, with the shining star.