algt colored stone identification report number 37742381 identification species .................................................................................... natural beryl variety ............................................................................................... emerald description Shape & Cutting Style ..................................... Marquise, Mixed Cut Measurements ................................................. 9.02 x 4.90 x 3.87 mm Carat Weight ............................................................................. 0.91 Carat Color ........................................................................... Intense/Vivid Green Transparency ......................................................................... Transparent additional grading characteristics color quality grade ................................................. fine color quality suggested origin ...................................................................... colombia comments minor amount of resin in fissures. clarity enhancement in emeralds is a common practice in trade. this enhancement is reversible at any time. main properties of emerald Chemical Composition ................................................. Be3Al2(SiO3)6 Crystal System ..................................................................... Hexagonal Mohs Hardness ........................................................................ 7.5 - 8.0 Specific Gravity ..................................................... 2.62 - 2.80 g/cm3 Optical Character .................................................................... Uniaxial- Refractive Index ............................................................ 1.560 - 1.602 Birefringence ................................................................... 0.004 - 0.010