What is “Ideal Cut”?

The cut of a diamond refers to the proportions of the diamond, depending on its shape.

Ideal cut dictates that every facet be placed at exact angles and proportions that create the ideal balance between maximum brilliance and dispersion (Prism Effect).

Proper cutting and proportioning alone release the full beauty of a diamond. These affect its durability and directly influence its price.

The story began in 1919, when the Belgian mathematician Marcel Tolkowsky published his findings, 'Diamond Design', in London. He based his calculations on the modern theories of light behavior.

His work came to be known today as the 'Ideal Cut' .

TABLE The large flat facet located at the top of the diamond. CROWN The top half of a diamond controls it’s fire, which is the dispersion of prismatic color that emerges from a diamond. PAVILION The bottom half of a diamond controls it’s brilliance - the white light. GIRDLE The diamond's edge that is beneath the crown and stand above the pavilion culet: is the small facet located at the bottom of a diamond and tapers off what would otherwise be a sharp and brittle point.

Tolkowsky’s calculations pointed out that for the optimum brilliance, a round brilliant cut diamond should have the following angles and proportions:

Do not confuse between 'Ideal Cut' diamonds and 'Tolkowsky Make / Cut' : 'Tolkowsky Make / Cut' means diamonds within the tolerance of the Tolkowsky’s calculation.

Conclusion:

An ideal cut diamond

Table diameter – 52.4% to 57.5%

Crown angle – 33.7°'' to 35.8°

   Crown height – 14.4% to 16.2%

Pavilion depth – 42.2% to 43.8%

   Total depth - 59.8% to 62.4%

   Pavillion angle – 40.5°'' to 41.5°

Girdle thickness – thin, medium, slightly thick.

Culet size – none, pointed, very small, small, and medium.

The consequence of flawless combinations results in the birth of the cupid effect. This is known as , "Hearts & Cupids", or popularly, the 'Hearts & Arrows'.