Abalone Pearls | 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.
Colors
Various

Abalone Pearls Classification

Common Name

Abalone Pearls

Species

Calcareous Concretions

Variety

Abalone Pearls

Colors

Various

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence blink, magnification and appearance.

Comments

Use 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 Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.4-1.5

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Dispersion

Comments

Abalone Pearls Chemistry & Crystallography

Chemical Name

calcium carbonate, conchiolin and water

Chemical Formula

CaCO3 with H2O and other organic materials

Synthesis

Crystal System

NA

Classification

Nature

Natural

Crystallinity

Aggregate

Comments

Abalone Pearls Characteristic Physical Properties

Hardness

Streak

Specific Gravity

Toughness

Fair

Inclusions

Abalone pearls will display strong iridescent colors and most show brownish or discolored area.

Luster

Dull, Vitreous

Stability

Poor

Fracture

Uneven

Cleavage

None

Comments

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