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Cushion

(The"Cushion Brilliant cut")
Cut in the plane of the girdle is oval in shape with high and very high "shoulders" or rounded rectangle cut – diamond (classic and modified). This category also include the majority of diamonds are old cut ("Old mine cut"). Faceted stone in a classic performance has 57 facets, 33 facets of the crown (octagonal platform with eight top wedges, eight main crown facets of the diamond-shaped, sixteen pairs of wedges) and 24 facets of the pavilion (sixteen parasang wedges and eight main facets in the form deltoid).

The main elements of the diamond "Cushion"
(measurements optimal cut shapes)

The calculation of the weight

Calculate the weight (in carats) of the diamond, Cushion-cut isometric shape for diamond is produced by the basic formula:

M = L x B x H x k

where M – mass cut diamond, L is the length of the faceted diamond, B – width of cut diamond, H – the height of the diamond, k – conversion factor metric measurements using the volume to mass, taking into account the geometry of the cut, and the density of diamond having a value of 0,00800.

While calculating weight of cushion-cut isometric forms, it is recommended to use an additional formula:

M = [(L + B + С + D)/4]² x H x k

where M – mass cut diamond, L is the length of the faceted diamond, B – width of cut diamond, C and D – the linear dimensions of the diagonals of the diamond, H be the height of the diamond, k – conversion factor metric measurements using the volume to mass, taking into account the geometry of the cut, and the density of diamond having a value of 0,00612.

More precisely, a weight is determined taking into account the amendments on the thickness of the girdle, bulge cut, size caletta, the ratio of the proportions of the cut.

Kind cut "Old mine cut" called "Mazarin" that has 33 facets and caletto, documented since 1640. A kind of "Peruzzi", with 57 facets and caletto and named in honor of an unidentified cutter, Vicencio, Peruzzi (Vicenzio Peruzzi) from Venice, first mentioned in 1750, the year in the "Treatise on diamonds and pearls" ("Treatise on Diamonds and Pearls") written by an English jeweler David Jefferies.