|Dimensions (mm)||not provided|
|Weight (carats)||not provided|
This is a stunning carving done by a machine with much detail and a top finish.The pearl [nacre ] shell glistens like opal colour.
Weight 20.25 cts app
size 40 x 30 x 3 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.
came early but was broken in half. the specimen looks ok, my first purchase from this site
Sorry to hear , would you like another?
|Starts||25th Jun 2009 11:05pm PDT|
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