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Pearls Necklace

Save 25%
Original price $20
Current price $15

A simple necklace made of pearls. 

 

Color: White


 

PEARLS

A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.

GENERAL

Category

Carbonate mineral, protein

Formula

·         Calcium carbonate, CaCO3

·         Conchiolin

Strunz classification

05.AB

Crystal system

Orthorhombic

IDENTIFICATION

Color

white, pink, silver, cream, brown, green, blue, black, yellow, orange, red, gold, purple, iridescent

Cleavage

None

Fracture

Uneven

Mohs scale hardness

2.5–4.5

Streak

white

Specific gravity

2.60–2.85

Refractive index

·         Common pearl: 1.52-1.66

·         Black pearl: 1.53-1.69

Birefringence

0.156

Pleochroism

Absent

Dispersion

None

UV fluorescence

·         White pearls: light blue to light yellow;

·         Yellow and golden pearls: yellow-green, greenish brown to dark brown;

·         Black pearls: commonly pink to orange-red