A star sapphire gemstone, 5.873 carats

Technical details: Type: Star Ruby Weight: 5.873 carats Dimensions (mm): 11.55x9.97x4.58 Shape: Cabochon Color: Red Clarity: Eye clean Transparency: Transparent Hardness: 9.0 Treatment: Glass filled Origin: Africa Certification: Certificate from Saudi laboratory (MT) - website (www.mtgl.com.sa) The Star Ruby is a rare type of ruby that shows a unique optical phenomenon known as "asterism" or "star effect." This phenomenon appears as a bright six-ray star that shows 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 crosswise inside the ruby crystal. The star ruby features its usual red color with this bright star.