NATURAL BROWN STAR SAPPHIRE GEMSTONES The star is a result of the light reflecting of off of the silky crystallizations of rutile inside the stone. CLARITY VS, EYE CLEAN. SHAPE: ROUND CABOCHON TREATMENT: NONE PIECES: AS IN PICTURE ———————————————————————————————————————————————————————— IN THIS AUCTION YOU WILL ALSO RECIEVE: THE CERTIFICATE OF AUTHENTICATION OF THE GEMSTONE AND ALSO A COPY OF THE GEMOLOGISTS’ CREDITATION FROM THE GEMOLOGICAL INSTITUTE OF AMERICA ———————————————————————————————————————————————————————— GEMOLOGIST INFORMATION: COMPANY GEMMOLIGIST HAS CERTIFIED THIS GEMSTONE AND CERTIFICATE INCLUDED WITH THIS GEMSTONE AS NATURAL STONE, MANSOOR RAHMAN GRADUATED FROM GEMOLOGICAL INSTITUTE OF AMERICA IN 1979 AND HAS WEALTH KNOWLEDGE ABOUT GEMSTONES AND ACTS AS CONSULTANT TO STARS AND GEMS ——————————————————- SAPPHIRE GEMOLOGY INFORMATION: Sapphire gemology Species: Corundum Color: Blue, colorless, pink, orange, yellow, green, purple, brownblack Chemical composition: Al2O3, Aluminum Oxide Crystal system: (Trigonal), doubly pointy, barrel-shaped, hexagonal pyramids, tabloid shaped Hardness: 9 (Mohs scale) Specific gravity: 3.95 - 4.03 Refractive index: 1.762 - 1.788 +0.08 -0.04 Birefringence: 0.008 Optical character: Uniaxial Color of streak: White Absorption spectrum: Blue, Sri Lanka: 471, 460, 455, 450, 379; Yellow: 471, 460, 450; Brown: 471, 460-450 Fluorescence: Blue: none; Colorless: orange-yellow, violet