Seed Pearls Gemstone & Information | Gemopedia by JTV | Gemopedia™

Seed Pearls

Seed pearls are very tiny, round, usually natural pearls that are under two millimeters in size. They are rarely seen today, but often found in antique jewelry or sewn into vintage clothing. Seed pearls can be produced by both freshwater and saltwater mollusks.

Colors

Almost Any Color Usually White, Cream

  • Seed-pearls classification

    CommonName
    Seed Pearls
    Species
    Pearl
    Variety
    Colors
    Almost Any Color Usually White, Cream
    AlternateNames
    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
    Seed pearls are usually less than 2mm in size and found in antique jewelry. Can be freshwater or saltwater.
  • Seed-pearls chemistry & crystallography

    ChemicalName
    calcium carbonate + conchiolin and water
    ChemicalFormula
    CaCO3
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Organic
    Nature
    Natural
    Crystallinity
    Aggregate
    ChemistryComments
  • Seed-pearls optical properties

    Transparency
    Translucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    Over the Limit 2.61-2.85
    Birefringence
    0.155
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Aggregate (AGG)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    None
  • Seed-pearls characteristic physical properties

    Hardness
    2.5-4.5
    CharacteristicComments
    Streak
    SpecificGravity
    Toughness
    Good
    Inclusions
    Seed pearls have an Iridescent surface.
    Luster
    Dull
    Stability
    Fair
    Fracture
    Uneven
    Cleavage
    None