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Inclusions and blemishes of a diamond The clarity of a diamond is a quality that is related to its existence and adding beauty to its visual appearance. It is one of the most important property of diamond grading besides carat, color and cut. Inclusions may be crystals of any foreign material or another diamond crystal, or even structural imperfections like cracks that can appear whitish or cloudy. Blue diamond of the crown A large 45.52 carat, fancy deep grayish-blue diamond, housed in Smithsonian Natural History Museum in Washington D.C. the “Hope Diamond” is legendary for the curse it puts on whomever possesses it. The diamond appears blue to the naked eye due to the presence of small traces of boron within it.