Tahitian Pearl | Gemopedia

Tahitian pearls, grown around Tahiti and French Polynesia, display a shimmering orient or overtone that is green, blue, pink or violet in color. These orient colors are in striking contrast to their silver to black body color and are sometimes given specific names (e.g., deep green is called fly wing; peacock is used for the combination of green and pink; eggplant is a dark toned body color combined with pink).
Alternate
Names
Black Pearl
Colors
Silver, Cream, Brown To Black, Gray, Blue, Green, Yellowish Green, Purple With Green, Rose Overtone.

Tahitian Pearl Classification

Common Name

Tahitian Pearl

Species

NA

Variety

Tahitian Pearl

Colors

Silver, Cream, Brown To Black, Gray, Blue, Green, Yellowish Green, Purple With Green, Rose Overtone.

Alternate Names

Black Pearl

Gemstone Groups

Key Separations

Appearance, 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.

Comments

Typical size of Tahitian pearls run 8 to 14mm. They are produced by black-lip mollusk Pinctada margaritifera in French Polynesia.

Tahitian Pearl Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.53-1.685

Birefringence

0.155

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

None

Dispersion

Comments

Tahitian Pearl Chemistry & Crystallography

Chemical Name

calcium carbonate + conchiolin and water

Chemical Formula

CaCO3

Synthesis

Crystal System

NA

Classification

Organic

Nature

Cultured

Crystallinity

Comments

Tahitian Pearl Characteristic Physical Properties

Hardness

2.5-4

Streak

Specific Gravity

2.72-2.78

Toughness

Good

Inclusions

Tahitian pearls have Intense luster and iridescent surface. If the pearl is drilled you can inspect the hole to look for bead nucleus.

Luster

Dull

Stability

Poor

Fracture

Uneven

Cleavage

None

Comments

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