Sri Lankan moonstone, 3.529 carats

Technical details: Type: Sri Lankan Moonstone Weight: 3.529 carats Shape: Cabochon Color: White Clarity: Eye-clean Transparency: Semi-Transparent Hardness: 6.0-6.5 Treatment: Untreated Origin: Sri Lankan Certification: Electronic certificate (PDF) from Saudi Laboratory (MT) - website (www.mtgl.com.sa) Moonstone is a gemstone belonging to the feldspar minerals group, known for a unique optical phenomenon called "adularescence," where a blue or white glow resembling moonlight appears to flow across its surface when moved. Moonstone is primarily composed of thin layers of albite and orthoclase. This stone is usually found in pegmatite and marble rocks, and some volcanic rocks.