Naturals: part of the original crystal surface remaining on the polished stone, frequently in the area of the girdle.
Polish Lines and Marks: tiny parallel lines or surface clouding left by irregular polishing or excessive heating during polishing, respectively.
Rough Girdle: a grainy or pitted girdle surface usually caused by poor workmanship.
Surface Graining: structural irregularities in crystal growth; may appear as faint lines, causing grooved or wavy surfaces and often cross facet junctions.
INCLUSIONS: Bearding: tiny feathers extending inward from a bruted girdle surface. (Bruting is the process of rubbing two diamonds together to achieve the rounded shape of the diamond).
Cavities and Chips: large/deep openings, and small/shallow openings in the diamond's surface, respectively.
Clouds: hazy or milky areas of many very small, usually crystalline inclusions.
Feathers: cleavages or fractures often white and feathery in appearance. (There are 4 cleavage planes in diamond, which run in octahedral directions. Fractures are breaks along planes other than cleavage planes and may alternate with them to form step-like feathers).
Included Crystals: mineral crystals, such as garnet or peridot, contained inside a diamond.
