EMERALD
Variety: Emerald
Species: Beryl Mohs Hardness: 7.5 to 8 out of 10 Color: Medium light to dark green, slightly yellowish green and bluish green RI: 1.577 to 1.583 (+/-0.017) Birefringence: 0.005 to 0.009 SR/DR/AGG: DR Clarity Type: Type III Optic Character: Uniaxial negative Pleochroism: Moderate to strong green & bluish green Spectrum: Broad absorption at 580 to 630nm. Lines at 646 & 662nm. Distinct lines at 680.5 & 683nm. Almost complete absorption of the violet. Fluorescence: Generally inert but fine colors may fluoresce orangy red to red under LW & SW (stronger reaction under LW) SG: 2.72 (+0.18 / -0.05) Routine Treatments: Oiling Additional Enhancements: Excessive oiling, fracture filling, fracture filling combined with dye |