Aquamarine Gemstone & Information | Gemopedia by JTV | Gemopedia™

Aquamarine

The birthstone for March, aquamarine is one of the most popular members of the beryl family, a sibling to emerald, morganite, bixbite, heliodor, and goshenite. The color ranges, depending on the relative concentrations and location of iron within the beryl crystal structure. Aquamarine's tranquil color and crystalline clarity capture the beauty of the sea, which is fitting as its name is formed from the Latin words "aqua," meaning water, and "mare," meaning sea. A favorite among gemstone lapidaries, rough aquamarine is relatively easy to fashion, so lapidaries often create imaginative aquamarine cuts and shapes.

Colors

Greenish Blue To Pale Blue-Green

  • Aquamarine classification

    CommonName
    Aquamarine
    Species
    Beryl
    Variety
    Aquamarine
    Colors
    Greenish Blue To Pale Blue-Green
    AlternateNames
    GemstoneGroups
    KeySeparations
    refractive index, birefringence, optic character, and Chelsea Colour Filter reaction
    ClassificationComments
    Chatoyancy or asterism are sometimes found in aquamarine. The RI of aquamarine is usually lower than other beryl varieties and runs between 1.569 to 1.575 and the SG tends to be about 2.67.
  • Aquamarine chemistry & crystallography

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

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.014
    OpticalComments
    RefractiveIndex
    1.577-1.583
    Tolerance:(+0.017/-0.017)
    Birefringence
    0.005-0.009
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    green or blue-green
    Pleochroism
    Dichroic, weak to moderate blue to slightly darker blue or greenish blue
  • Aquamarine characteristic physical properties

    Hardness
    7.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.67-2.9 Range:0.18/-0.05 Typical:2.72
    Toughness
    Good
    Inclusions
    Aquamarine is a type I clarity stone. Stones are typically clean but sometimes contain "fingerprints" and liquid inclusions, 2-phase or 3-phase inclusions, hollow or liquid filled parallel tubes, spiky cavities and tubes parallel to the length of the crystal that look like rain, mica flakes. Crystal inclusions include apatite, almandite and spessartite garnet, quartz and tourmaline. Star aquamarine will have a weak 6 or 4 rayed star and sometimes both.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    Poor, in one direction