Seed Pearls Gemstone & Information | Gemopedia by JTV | Gemopedia™
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.
Almost Any Color Usually White, Cream
Seed-pearls classificationCommonNameSeed PearlsSpeciesPearlVarietyColorsAlmost Any Color Usually White, CreamAlternateNamesGemstoneGroupsKeySeparationsAppearance, 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.ClassificationCommentsSeed pearls are usually less than 2mm in size and found in antique jewelry. Can be freshwater or saltwater.
Seed-pearls chemistry & crystallographyChemicalNamecalcium carbonate + conchiolin and waterChemicalFormulaCaCO3SynthesisCrystalSystemNAChemistryClassificationOrganicNatureNaturalCrystallinityAggregateChemistryComments
Seed-pearls optical propertiesTransparencyTranslucent - OpaqueDispersionOpticalCommentsRefractiveIndexOver the Limit 2.61-2.85Birefringence0.155OpticCharacterNAOpticSignNAPolariscopeReactionAggregate (AGG)FluorescenceSWUV:
Seed-pearls characteristic physical propertiesHardness2.5-4.5CharacteristicCommentsStreakSpecificGravityToughnessGoodInclusionsSeed pearls have an Iridescent surface.LusterDullStabilityFairFractureUnevenCleavageNone