Verging on museum quality upper anterior Megalodon tooth. AnterI or teeth are often sought-after. Enamel is smooth and even on the blade. Well-defined bourrelet extending width of tooth. Root is mostly smooth with only minor irregularities. Serratio
|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 26.55 cts app
size 40 x 30 x 4 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 Jul 2013 8:01pm PDT|
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