Solid Blister Pearl | Gemopedia

Solid blister pearls are bumpy growths formed on the inside surface of shells (not the traditional pearl as it grows attached to shell rather than inside the mollusk's body). They are hemispherical or irregular in shape and are cut from the shell.
Alternate
Names
American Dome(R)
Colors
White, Cream, Gray, Pink, Lavender

Solid Blister Pearl Classification

Common Name

Solid Blister Pearl

Species

Cultured Pearl

Variety

Solid Blister Pearl

Colors

White, Cream, Gray, Pink, Lavender

Alternate Names

American Dome(R)

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

Solid blister pearls are created by inserting a plastic hemisphere against the side of a fresh water oyster and nacre layers are laid down over the blank and then a mother-of-pearl boarder is cut out around the pearl.

Solid Blister 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:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Comments

Solid Blister Pearl Chemistry & Crystallography

Chemical Name

calcium carbonate + conchiolin and water

Chemical Formula

CaCO3

Synthesis

Crystal System

NA

Classification

Organic

Nature

Cultured

Crystallinity

Non-Crystalline

Comments

Solid Blister Pearl Characteristic Physical Properties

Hardness

2.5-4

Streak

Specific Gravity

Toughness

Good

Inclusions

Solid blister pearl have an Iridescent surface.

Luster

Pearly

Stability

Poor

Fracture

Uneven

Cleavage

None

Comments

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