Abalone Pearls Gemstone & Information | Gemopedia by JTV | Gemopedia™
Abalone is a gastropod that produces nacreous pearls of great size and beauty but, since the mollusk only has one shell, the pearls almost always form in a baroque horn shape. Considered by some to be the most beautiful pearl, each can display a rainbow of iridescent colors, including blue, green, lavender, pink, orange and silver. As abalone pearls are difficult to harvest, they are among the rarest in the market.
Abalone-pearls classificationCommonNameAbalone PearlsSpeciesCalcareous ConcretionsVarietyAbalone PearlsColorsVariousAlternateNamesGemstoneGroupsKeySeparationsRI, birefringence blink, magnification and appearance.ClassificationCommentsUse birefringence blink method to obtain birefringence. Abalone pearls are not considered true pearls. Some pearls are hollow and come from abalone and paua shells. There are 96 known varieties of abalone with different colors and sizes which effect the color, size and shape of the pearls produced. Magenta and peacock blue colors are the most valued.
Abalone-pearls chemistry & crystallographyChemicalNamecalcium carbonate, conchiolin and waterChemicalFormulaCaCO3 with H2O and other organic materialsSynthesisCrystalSystemNAChemistryClassificationNatureNaturalCrystallinityAggregateChemistryComments
Abalone-pearls optical propertiesTransparencySemitranslucent - OpaqueDispersionOpticalCommentsRefractiveIndex1.4-1.5BirefringenceOpticCharacterOpticSignPolariscopeReactionAggregate (AGG)FluorescenceSWUV:
Abalone-pearls characteristic physical propertiesHardnessCharacteristicCommentsStreakSpecificGravityToughnessFairInclusionsAbalone pearls will display strong iridescent colors and most show brownish or discolored area.LusterStabilityPoorFractureUnevenCleavageNone