US 2006/0124119 A1Published application

Method for cutting diamond

AssigneeDiana Sun Diamond Co., Ltd.

InventorNaotake Shuto

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Abstract

To provide a diamond rendering reflective light off the table goldenly brilliant by making a proportion thereof symmetry at any place viewed from an upper face, a side face or a bottom face, first reference lines, second reference lines crossing the first reference lines at right angles and third reference lines equally dividing the first reference lines and the second reference lines into four equal parts, respectively are provided. A first arc line is made by intersections of the reference lines. The approximately regular hexadecagon shaped table is established by connection of the intersections of the reference lines with the first arc line. Fourth reference lines dividing the third reference lines into two equal parts and a second arc line with a circle concentric with and larger than the first arc line is made. Star facets are established by connection of the intersections among the fourth reference lines and the second arc line with the top of the table. Upper main facets are established by connection of intersections of a diamond outward appearance and the first and the third reference lines with intersections of the fourth reference lines and the second arc line.

Claims5

Dependent claims

A method for cutting a diamond having a girdle, a crown formed on an upper side of the girdle and provided with a table at an upper portion thereof, and a pavilion formed on a lower side of the girdle, comprising the steps of:

providing a first reference line on a diamond, providing on the diamond a second reference line crossing the first reference line at right angles thereto, providing on the diamond third reference lines dividing a sector between the first and second reference lines into four equal parts, providing on the diamond a first arc-connected line having a diameter equal to that of the table and passing an intersection of these reference lines, and connecting intersections of these reference lines and first arc-connected line together to define the table of a substantially 16-cornered right polygonal shape,
providing on the diamond fourth reference lines dividing sectors between the third reference lines into two equal parts to form a second arc-connected line concentric with and larger than the first arc-connected line, connecting intersections of the fourth reference lines and second arc-connected line and a center of the table together to define star facets,
connecting intersections of an outermost edge of the diamond and first to third reference lines and intersections of the fourth reference line and second arc-connected line together to establish upper main facets, and paired upper girdle facets between the upper main facets and the outermost edge of the diamond, and
cutting the diamond along the contours of the established facets.

1 more element

Dependencies are inferred from the claim text.