Emerald Gemstone & Information | Gemopedia by JTV | Gemopedia™

Emerald

Few gemstones command as much desire and passion as emerald. Since antiquity, emerald's rich "green fire" has symbolized eternal spring and immortality. Long shrouded in myth and lore, it has reigned as the supreme green gem with no indication that its position will ever change. The favorite of Cleopatra, Spanish Conquistadors and today's Red Carpet, wars have waged over this treasured stone. In the 1st century AD, Roman historian Pliny the Elder wrote that "nothing greens greener" than emeralda sentiment that continues today, as it remains one of the most sought-after gems on the market. The beautiful green hues of this beryl variety, combined with its rarity, make it one of the world's most valuable gemstones.

Colors

Light To Very Dark Green To Bluish Green, Slightly Yellowish Green

  • Emerald classification

    CommonName
    Emerald
    Species
    Beryl
    Variety
    Emerald
    Colors
    Light To Very Dark Green To Bluish Green, Slightly Yellowish Green
    AlternateNames
    GemstoneGroups
    KeySeparations
    refractive index, birefringence, optic character, pleochroism, spectrum and possibly magnification
    ClassificationComments
    Due to their included nature emeralds are almost always oiled. Chatoyancy and asterism are possible in emeralds.
  • Emerald chemistry & crystallography

    ChemicalName
    beryllium aluminum silicate
    ChemicalFormula
    Be3Al2(SiO3)6
    Synthesis
    CrystalSystem
    Hexagonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Emerald optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.014
    OpticalComments
    RefractiveIndex
    1.577-1.6
    Tolerance:(+0.017/-0.017)
    Birefringence
    0.005-0.009
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert to weak orangy red to red
    LWUV: Inert to strong orangy red to red
    CCFReaction
    Some appear pink or red; not diagnostic.
    Pleochroism
    Dichroic, moderate to strong, varying shades of body color
  • Emerald characteristic physical properties

    Hardness
    7.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.67-2.9 Range:0.18/-0.05 Typical:2.72
    Toughness
    Poor
    Inclusions
    Emerald is a type III clarity stone. 3-phase inclusions typical of Colombian material. 2-phase inclusions usually found in stones from India. Tremolite needles are typical of Zimbabwe stones. Actinolite needles can be found in Siberian stones. Emeralds sometime have tube-like and bamboo-like inclusions, liquid and fingerprint inclusions, calcite, pyrite, mica, needles and amphibole inclusions.
    Luster
    Vitreous
    Stability
    Fair
    Fracture
    Conchoidal
    Cleavage
    Poor, in one direction