process of the growth and creation of a diamond inside the
earth does not occur evenly, but in several phases. In each
phase, the conditions such as temperature, pressure and
cooling are not the same and do not always remain constant.
As a result, most diamonds contain what are called inclusions,
internal features caused by the constantly changing conditions
during different phases of the diamond's creation. These
inclusions come in many forms including cloud-like features,
fracture or tension cracks or even enclosed minerals that
were present during the growth process of the diamond.
GIA (Gemological Institute of America) has designated that
clarity of diamonds is graded under the following guidelines:
Diamond free from internal and external flaws under 10X
Absolutely free from internal faults under 10X magnification.
May contain external features that should be so small that
they can easily be removed by polishing.
Very, very small inclusions in the stone, very difficult
to recognize under 10X magnification. These inclusions can
not be in the field of the table.
Very, very small inclusions anywhere in the stone, only
smallest external defects allowed.
Only the smallest inclusions are allowable in the field
of the table and only small faults elsewhere in the stone.
Very small internal faults. Small external defects.
Small internal faults, not visible to the naked eye.
Small, easily seen inclusions under magnification in the
table, but still not visible to the naked eye.
Inclusions easily seen under magnification, but difficult
to see with the naked eye. Inclusions do not influence brilliance.
Large and numerous inclusions, just barely visible to the
naked eye through the crown. Inclusions slightly diminish
Large and numerous inclusions, easily visible to the naked
eye, dimishing brilliance.