Star sapphire stone, 8.43 carats

Technical details: Type: Star Sapphire Weight: 8.427 carats Dimensions (mm): 10.99x10.48x6.84 Shape: Cabochon Color: Blue Clarity: Eye clean 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 "star" or "asterism." This phenomenon appears as a bright six-rayed star (sometimes twelve) that appears and moves on the polished surface of the domed (cabochon) 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.