The quality or condition of being imperfect; lack of perfection; incompleteness; deficiency; fault or blemish.
A quality characteristic's departure from its intended level or state without any association to conformance to specification requirements or to the usability of a product or service (see also "blemish," "defect" and "nonconformity").
A flaw or blemish, caused by nature or man, on the outer surface or the stone's interior. Poor color or an unskilled cut is not classified as an imperfection, though it will, of course, play a role in value determination.
Blemish located within the stone occasionally reaching the exterior.
A general term used to refer to any external blemish or internal inclusion or flaw on or in a fashioned diamond; e.g., a feather, carbon spot, knot, fissure, scratch, natural, etc. The term “flaw” and “imperfection” are usually used interchangeably.
Any flaw, crack, carbon spot, cloud or other blemish of any sort observable in a gemstone, when the latter is examined by a trained eye under a 10-power magnifier.
Flaw, any deviation from perfection, as in a crystal.
A general term used to refer to any inclusion, internal or external in a gemstone -- a feather, carbon spot, knot, fissure, or scratch.
A term used to refer to any internal or external flaw on a cut and polished gemstone.