Beautiful tourmaline stones. Excellent for my project. Hope to buy again.
|Dimensions (mm)||12 x 11 x 2mm|
|Weight (carats)||not provided|
MOTHER OF PEARL CARVING
This is a parcel of 4 well carved shells with ROSE flowers carvings on it. The pearl [nacre ] shell glistens like opal colour.
Ideal for earrings.
Weight of parcel 9.85 cts app
Size of largest 12 X 11 X 2 mm app
Nacre is made mostly of aragonite--a calcium carbonate crystal--arranged in 500-nanometer-thick layers. It forms from ions in seawater that washes through an organic "scaffold" of thin, interconnected, horizontal sheets--the animal essentially lays the "mortar" before filling in the "bricks." The iridescence of mother-of-pearl comes from the interference of light as it reflects from the thin, crystalline layers. But the beauty is only part of what drew Pupa Gilbert, of the University of Wisconsin, Madison, to study nacre. "Materials scientists have been interested in mother-of-pearl for decades because this material is 3000 times more resistant to fracture than its components," she says, referring to the organic and crystalline constituents.
|Starts||2nd Apr 2010 10:51pm PDT|
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