Mabe Pearl Gemstone & Information | Gemopedia by JTV | Gemopedia™
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.
White, Cream, Gray, Pink, Lavender
Mabe-pearl classificationCommonNameMabe PearlSpeciesNAVarietyColorsWhite, Cream, Gray, Pink, LavenderAlternateNamesBlister PearlGemstoneGroupsKeySeparationsAppearance, 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.ClassificationCommentsMabe 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 & crystallographyChemicalNamecalcium carbonate + conchiolin and waterChemicalFormulaCaCO3SynthesisassembledCrystalSystemNAChemistryClassificationOrganicNatureCompositeCrystallinityNon-CrystallineChemistryComments
Mabe-pearl optical propertiesTransparencyTranslucent - OpaqueDispersionOpticalCommentsRefractiveIndex1.53-1.685Birefringence0.155OpticCharacterNAOpticSignNAPolariscopeReactionFluorescenceSWUV:
Mabe-pearl characteristic physical propertiesHardness2.5-4CharacteristicCommentsStreakSpecificGravityToughnessPoorInclusionsMabe pearls have an Iridescent surface.LusterPearlyStabilityPoorFractureUnevenCleavageNone