It seems miraculous that the traditional 58 tiny facets in a diamond, each precisely cut and sharply defined, may be only two millimetres in diameter. But without this precision, a diamond wouldn’t be near as beautiful as it is. Without a doubt, the allure of a particular diamond depends more on cut than anything else.

The cut of a diamond has three attributes: brightness (the total light reflected from a diamond), fire (the dispersion of light into the colors of the spectrum), and scintillation (the light flashes – or sparkle – when a diamond moves).

Ideal proportions, finish and symmetry of a cut are the aim of the cutter, as well as the shape of the stone. There is a difference though between cut and shape. Shape means the outward look of the diamond (such as round, radiant, oval and so on). Cut refers to the reflective qualities of the diamond and may very well be the most important of the 4C's.

Cut quality is divided as follows:

Ideal Cut; Premium Cut; Fine Cut; Good Cut; Fair Cut; Poor Cut.

The Ideal, Premium, Fine and Good cut grades vary respectively, from maximum brilliance, to reflecting most of the light that enters the diamond. Diamond proportions graded as Fair or Poor mean that the diamond reflects only a fraction of the light that enters it.

The wrong proportions might cause the diamond to lose its brilliance, scintillation, and fire, and look artificial.

The finish of a diamond refers to the small details affected by the cutter’s work, such as symmetry and quality of facets: the crown, culet, table, girdle and pavilion.

- Crown: the upper part of the diamond which lies above the girdle;
- Culet: the minute facet at the base of the pavilion;
- Table: the large flat facet of the diamond;
- Girdle: the outer edge of a diamond where the crown and pavilion meet;
- Pavilion: the lower part of the diamond which lies below the girdle.


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