Any black-appearing inclusions in a diamond caused by the addition of the minerals graphite or hornblende.
It is a black-appearing inclusions in diamonds, which is caused by the addition of graphite or homblende minerals.
An inaccurate term used by some people in the jewelry industry to describe the appearance of certain inclusions in a diamond. The term refers to included crystals that have a dark appearance, rather than a white or transparent appearance, when viewed under a microscope. In most cases, these dark inclusions are not visible to the naked eye, and do not affect the brilliance of the diamond.
These are included crystals that have a dark appearance, rather than a transparent or white appearance, when viewed under a microscope. On the international grading system, these carbon spots would be portrayed in the clarity grading.
Since diamonds are made up of compressed carbon, carbon clusters can sometimes be found. These spots are also called inclusions. The number or severity of inclusions determines the clarity of a diamond, when grading it for quality purposes.
Any black-appearing inclusion or imperfection in a diamond. Actually, black inclusions are rare, although some may occasionally be graphite or small particles of another mineral. Although many diamond contain inclusions that "appear" black under ordinary lighting, dark-filled illumination, plus magnification, shows most to be caused by reflection from cleavages or included transparent diamond crystals or other transparent minerals.