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diamond clarity
Diamond clarity is a quality of diamonds relating 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.〔(【引用サイトリンク】 title=Diamond Buying Guide )〕 Inclusions may be crystals of a foreign material or another diamond crystal, or structural imperfections such as tiny cracks that can 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.
Most inclusions present in gem-quality diamonds do not affect the diamonds' performance or structural integrity and are not visible to the naked eyes.〔 However, large clouds can affect a diamond's ability to transmit and scatter light. Large cracks close to or breaking the surface may reduce a diamond's resistance to fracture.
Diamonds with higher clarity grades are more valued, with the exceedingly rare ''Flawless'' graded diamond fetching the highest price.〔 Minor inclusions or blemishes are useful, as they can be used as unique identifying marks analogous to fingerprints. In addition, as synthetic diamond technology improves and distinguishing between natural and synthetic diamonds becomes more difficult, inclusions or blemishes can be used as proof of natural origin.
==Inclusions and blemishes==
(詳細はdiamond enhancement procedures, such as laser lines, are also considered inclusions or blemishes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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