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Diamonds are mainly irradiated to become blue-green or green, although other colors are possible. [29] When light-to-medium-yellow diamonds are treated with gamma rays they may become green; with a high-energy electron beam, blue. [23] The difference in results may be caused by local heating of the stones, which occurs when the latter method is ...
Colored dye or smudges can affect the perceived color of a gem. [citation needed] Historically, some jewelers' diamonds were mis-graded due to smudges on the girdle, or dye on the culet. [citation needed] Current practice is to thoroughly clean a gem before grading its color as well as clarity. [citation needed]
The clarity, or purity, of a diamond refers to internal inclusions of the diamond, and is one of the 4-Cs in determining a diamond's value.Common inclusions that appear inside diamonds are black carbon spots and small cracks, commonly referred to as fractures or "feathers", due to their feathery whitish appearance when viewed from above or through the side.
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Current practice is to clean a diamond thoroughly before grading its color. Maintaining a clean diamond can sometimes be difficult as jewelry settings can obstruct cleaning, and oils, grease, and other hydrophobic materials adhere well to a diamond. Furthermore, the intricate facets of certain diamond cuts may trap dirt and grime, requiring ...
After thoroughly cleaning the diamond, the diamond is picked up using tweezers in a girdle-to-girdle hold. The grader views the diamond for the first time through the table, studying the culet area of the stone for inclusions. The diamond is then set down and picked up with the tweezers in a table-to-culet hold.
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Color grading of diamonds was performed as a step of sorting rough diamonds for sale by the London Diamond Syndicate. As the diamond trade developed, early diamond grades were introduced. Without any co-operative development, these early grading systems lacked standard nomenclature and consistency. Some early grading scales were; I, II, III; A, AA, AAA; A, B, C. Numerous terms