(Se-57, "Heart-Shaped Modified Brilliant", "Heart cut")
Cut this kind has the shape of an oval with high or very high "shoulders" or rounded rectangle, type-cut – diamond (classic and modified), and this type include diamonds old cut diamonds, ("Old mine cut"). Faceted stone in a classic performance has 57 facets, including the octagonal pad, the top eight wedges of the crown, nine main facets of the crown in the form of a rhombus, sixteen pairs (bottom) wedges of the crown, sixteen pairs of wedges of the pavilion and the seven main facets of the pavilion in the form of deltoid.Possible options for the cut and with a different number of faces.

The basic elements of a diamond cut shape "Heart"
(the settings are for optimal cut shapes)

The calculation of the weight

Calculate the weight (in carats) of the standard diamond-cut "Heart" is made on the basic formula:

M = L x B x H x k

where M – mass cut diamond, L is the length of the cut of a diamond, the width 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 and having an average value 0,00590.
More precisely, a weight is determined taking into account the amendments on the thickness of the girdle, the convexity of the cut, the size of the faces of the chamfers, the size of the caletta and the ratio of the proportions of the cut.

The first (1463) of the famous diamonds, shaped cut diamond, close to the modern form "heart", is the diamond mentioned in the letter of Galeazzo Sforza (Galeazzo Maria Sforza), Duke of Milan. We also know about the diamond from the ring of the Scottish Queen Mary Stuart, presented by her to the English Queen Elizabeth I in 1562.The first image of the diamond-shaped heart is the portrait of "Princess Gonzaga" written by the artist Franz Porbo (Frans Pourbus) in 1605, which depicts Margherita Gonzaga (Margherita Gonzaga, 1591-1632), diamond in the suspension on the sleeve of the dress. It is possible that all these diamonds were cut "rose", and was not fully faceted stones.

The other most famous diamond with the outline of the "heart" is brilliant "Cullinan V" inserted in a buckle for a belt, known as the "Brooch heart". Diamonds in the form of "heart" in its present form (with embedded faces) appeared only in the XX century and their mass production was started only in the second half of the twentieth century.