Solid Blister Pearl Gemstone & Information | Gemopedia by JTV | Gemopedia™
Solid blister pearls are bumpy growths formed on the inside surface of shells (not the traditional pearl as it grows attached to shell rather than inside the mollusk's body). They are hemispherical or irregular in shape and are cut from the shell.
White, Cream, Gray, Pink, Lavender
Solid-blister-pearl classificationCommonNameSolid Blister PearlSpeciesCultured PearlVarietySolid Blister PearlColorsWhite, Cream, Gray, Pink, LavenderAlternateNamesAmerican Dome(R)GemstoneGroupsKeySeparationsAppearance, 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.ClassificationCommentsSolid blister pearls are created by inserting a plastic hemisphere against the side of a fresh water oyster and nacre layers are laid down over the blank and then a mother-of-pearl boarder is cut out around the pearl.
Solid-blister-pearl chemistry & crystallographyChemicalNamecalcium carbonate + conchiolin and waterChemicalFormulaCaCO3SynthesisCrystalSystemNAChemistryClassificationOrganicNatureCulturedCrystallinityNon-CrystallineChemistryComments
Solid-blister-pearl optical propertiesTransparencyTranslucent - OpaqueDispersionOpticalCommentsRefractiveIndex1.53-1.685Birefringence0.155OpticCharacterNAOpticSignNAPolariscopeReactionAggregate (AGG)FluorescenceSWUV:
Solid-blister-pearl characteristic physical propertiesHardness2.5-4CharacteristicCommentsStreakSpecificGravityToughnessGoodInclusionsSolid blister pearl have an Iridescent surface.LusterPearlyStabilityPoorFractureUnevenCleavageNone