A diamond with eighty-one facets having a ten hearts and ten arrows inner structure and a cutting method thereof

A cutting method for a diamond with eighty-one facets having a ten hearts and ten arrows inner structure, comprising the following steps of:

• dividing a diamond blank into a pavilion, a crown and a girdle;
• pavilion cutting:
• cutting out the pavilion of the diamond;
• cutting the pavilion into ten main pavilion facets, wherein each main pavilion facet is in a sector shape, and an angle between the main pavilion facet and the girdle is 40.5-40.8°;
• each main pavilion facet has two main pavilion facet edges, and a bottom boundary line of the main pavilion facet, referred to as a first boundary line, is disposed at a junction of the main pavilion facet with the girdle;
• and
• cutting out two main pavilion facet auxiliary surfaces at a junction of two adjacent main pavilion facets, wherein the number of the auxiliary surfaces is twenty;
• two adjacent auxiliary surfaces are formed between two adjacent main pavilion facets, the two auxiliary surfaces share one edge, and each auxiliary surface has an auxiliary surface edge sharing with the main pavilion facet;
• and, a bottom boundary line of the auxiliary surface, referred to as a second boundary line, is disposed at a junction of the auxiliary surface with the girdle;
• and
• crown cutting:
• cutting out ten main crown facets on the crown of the diamond, wherein each main crown facet has two main crown facet edges, and two adjacent main crown facets share one main crown facet edge;
• and, each main crown facet is connected to the table facet and the girdle, and an angle between the main crown facet and the girdle is 34-35°;
• cutting out a crown star facet at a junction of two adjacent main crown facets with the table facet, wherein the number of the crown star facets is ten, each crown star facet is connected to the table facet and has two crown star facet waists;
• cutting out a crown small facet at a junction of two adjacent main crown facets and the crown star facet, wherein the number of the crown small facets is ten;
• each crown small facet is disposed between two adjacent main crown facets and between the crown star facet and the girdle;
• and the crown small facet has a short side of the crown small facet shared with the crown star facet, and two first edges;
• and
• cutting out a small sector at a junction of the main crown facet and the crown small facet, wherein the number of the small sectors is twenty, each small sector is connected to the girdle, and each small sector has two small sector edges;
• and,
• after the above cutting, the main crown facet is a hexagon which is symmetrical in a circumferential direction, the crown star facet is a trapezoid which is symmetrical in the circumferential direction, and the crown small facet is a pentagon which is symmetrical in the circumferential direction.