Diamond Grading

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 caratcolor, and cut.

Inclusions are solids, liquids, or gases that were trapped in a mineral as it formed. They may be crystals of a foreign material or even another diamond crystal or may have produced structural imperfections, such as tiny cracks that make a diamond appear whitish or cloudy. The number, size, color, relative location, orientation, and visibility of inclusions can all affect the relative clarity of a diamond. A clarity grade is assigned based on the overall appearance of the stone under ten times magnification, which is a magnification standard for loupes used in the gem world.



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CHEMICAL COMPOSITION: Different form of carbon (graphite, amorphous, diamond.)

GEOLOGICAL OCCURENCES AND THEIR HISTORY : Gem and Industrial diamond, kimberlite (mines); Alluvial deposits (river beds); Marine deposits (beaches, sea-bed); Meteoric diamonds; localities like Australia’ Borneo’ Brazil’ India’ Sierra Leon, Russia; South Africa; South West Africa; Zaire, Canada etc.

EXTRACTION OF DIAMONDS : Crushing, Washing ad Screening, Heavy media separator; Grease table, Grease belt, X-ray separation.