Carat weight - The weight or size of a diamond is measured in carats. A single carat is made up of one hundred segments called "points." One hundred and fifty points equals one and one half carats.
Clarity - This expresses how perfect the diamond is by identifying the flaws or inclusions. The value of the stone is determined by where the inclusions are, how big they are, and their type.
Inclusions are shown as follows (under 10x magnification):
FL = Flawless
IF = Internally Flawless - minor surface blemishes,
VVS1-VVS2 = Very, Very Small inclusions,
VS1-VS2 = Very Small Inclusions,
SI1-SI2 = Small Inclusions,
I1-I2-I3 = Imperfect - inclusions visible to the eye.
Slight inclusions, do not reduce the beauty of the stone although they do reduce the value.
Color - Colorless diamonds are extremely rare in nature. Color definitely helps determine the value of a stone. Different gradations from high white to the start of the yellows are not easily seen by an unpracticed eye. Bright-colored diamonds are a bit different. Some examples are blue, amber, red, etc. Bright colored diamonds in larger sizes can command very high prices indeed. Collectors worldwide are eager to acquire them.
Cut - Precise formulae are to determine the appropriate cut for a diamond. A typical diamonds is cut with 58 facets. The stone's light-reflecting properties and its light dispersion are critical measurements in determining the stones quality and value.
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