GIA.EDU Diamond Media Education Page: Choose a Diamond Video

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The 4 C’s : Carat, Cut, Clarity and Color

CARAT - weight and size

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The Carat pertains to the weight of a diamond. A carat is usually divided in 100 points (very small diamonds
can be divided in 1000 points, i.e. 0.005 carat). One carat equals 0.2 grams. A one carat brilliant round cut
diamond has a diameter of 6.5 more

CUT - symmetry and proportions

Refers to the symmetry and proportions of the stone, it is what gives the diamond the ability to reflect light
(sparkle). It is the only aspect of the 4 C’s that is directly influenced by man. The other 3 are dictated by nature.
The “cut” is often confused with the "shape".read more

CLARITY - amount of inclusions

The amount of inclusions (internal) and blemishes (external) are rated to express how transparent and how
strong the diamond is. For jewelry grade diamonds the rating is from Small inclusion 2, to Flawless.
read more

COLOR - from white “transparent” to yellowish

Graded from D (best) to I (near colorless).
K to Z (noticeable color, not suited for jewelry) read more

Shape - from round to square

Defines the outer shape i.e. round, triangular, princess “square”, oval, pear etc… Any of the above
shapes can have an Ideal to poor cut. The shape has nothing to do with the quality of the cut.
read more

Quality - reports & appraisals

  • A diamond report (certificate) is a document that will validate the quality and
    measurement (4 C’s) of the stone.
  • A diamond appraisal will inform you of the retail value of your stone, an important
    item for insurance purposes
    read more