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The blemish may be microscopic or visible to the naked eye. The spots are undesirable imperfections since they can be seen more easily than other flaws. While diamonds are composed of purely carbon, the black spot flaws could be other inclusions (foreign matter) such as olivine, garnet, pyrite, silica, calcite, and iron oxides.
Histology slide of a solar lentigo. Differently from the melanotic nevi and the verrucous nevi on the skin, age spots change in color and in shape with time. Wang-Michelitsch and Michelitsch propose a hypothesis inspired by their misrepair-accumulation aging theory [12] for the development of age spots. [13]
Diamond clarity is the quality of diamonds that relates to the existence and visual appearance of internal characteristics of a diamond called inclusions, and surface defects, called blemishes. Clarity is one of the four Cs of diamond grading, the others being carat, color, and cut.
In addition to causing tuber blemish symptoms, C. coccodes also causes symptoms on stems and foliage, which result in crop losses, and is implicated as a factor in the potato early dying disease complex. In the past the pathogen was not regarded as an issue, but it has become more prevalent.
These blemishes include: blindness; lameness; an excessively low nasal bridge (such that a straight brush could apply ointment to both eyes simultaneously) disproportionate limbs; a crippled foot or hand; cataracts; a white streak that transverses the junction between sclera and iris; certain types of boils; crushed testicles [1]
While these are considered as blemishes, the presence of naturals is a sign of good cutting practice, where the cutter has managed to retain as much of the original weight as possible. Indented naturals are also seen to exist on some stones, where the portion of the natural is seen to dip inside slightly from the diameter of the stone.
"Against a Wen" is an Old English metrical charm and medical text found in the London, British Library, Royal MS. 4A.XIV. It appears to describe a remedy for ridding oneself of a wen, which is an Old English term for a cyst or skin blemish.
A significant blemish in the sculpture may be the reason why the work remained in storage for so long. The lower part of one putti's left arm was not finished at the elbow. The thin portion of marble that was left was inadequate to finish carving the defective arm.
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