Mabe Pearl Gemstone & Information | Gemopedia by JTV | Gemopedia™

Mabe Pearl

Mab pearls are unique in that they are shaped as a hemisphere, having one flat side. Traditionally, these are blister pearls, forming flat on the shell. The pearl is then "worked" by it from the shell. Today, they are often cultured by inserting a hemispheric nucleus. Mab pearls come in a wide range of beautiful colors, ranging from light pinks to more bluish shades. Lovely to gaze upon, mab pearls often have excellent luster and orient. Because of their flattened side, they are usually not as expensive as spherical pearls.

Colors

White, Cream, Gray, Pink, Lavender

  • Mabe-pearl classification

    CommonName
    Mabe Pearl
    Species
    NA
    Variety
    Colors
    White, Cream, Gray, Pink, Lavender
    AlternateNames
    Blister Pearl
    GemstoneGroups
    KeySeparations
    Appearance, RI, birefringence blink and magnification. A "tooth test" is commonly used in which a pearl is rubbed against a tooth; if gritty, this is an indication that the surface is nacre, versus plastic and glass imitations that feel smooth.
    ClassificationComments
    Mabe pearls are most commonly round or pear shaped. A plastic hemisphere is placed against the side of a Pteria penguin oyster and nacre layers is laid down over the blank. The mabe pearl is then cut out of the shell filled and backed with mother-of-pearl.
  • Mabe-pearl chemistry & crystallography

    ChemicalName
    calcium carbonate + conchiolin and water
    ChemicalFormula
    CaCO3
    Synthesis
    assembled
    CrystalSystem
    NA
    ChemistryClassification
    Organic
    Nature
    Composite
    Crystallinity
    Non-Crystalline
    ChemistryComments
  • Mabe-pearl optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.53-1.685
    Birefringence
    0.155
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    None
  • Mabe-pearl characteristic physical properties

    Hardness
    2.5-4
    CharacteristicComments
    Streak
    SpecificGravity
    Toughness
    Poor
    Inclusions
    Mabe pearls have an Iridescent surface.
    Luster
    Pearly
    Stability
    Poor
    Fracture
    Uneven
    Cleavage
    None