B - Operations – Transporting – 24 – B
Patent
B - Operations, Transporting
24
B
63/18, 26/205, 5
B24B 9/16 (2006.01) A44C 17/00 (2006.01)
Patent
CA 1062484
ABSTRACT OF THE DISCLOSURE A method is provide for polishing a gemstone and to a novel gemstone per se. The method includes the steps of forming a table, polishing an off number of faces on a base, which faces converge to a point and forming a plurality of facets on the girdle of the stone between the base and the table whereby the inclination of the faces with respect to the table is such that light entering the table substantially normal thereto is internally reflected to the opposite corner where it is subsequently internally reflected back to the face of initial incidence and out of the upper part of the stone to impart brilliance thereto. The gemstone is characterised by having a tuble portion defined by a table and a girdle having a periphery greater than the periphery of the table to define a pyramidal table portion and a base defined by a plurality of faces converging towards a point on the side of the gridle opposite the table portion which stone has an odd number of sides, the inclination of the faces to the plane of the table permitting light entering the table substantially normal thereto to be internally reflected at an opposite corner for subsequent internal reflection at the face of initial incidence and out of the upper part of the stone to impart brilliance thereto. Gemstones in accordance with aspects of the present invention particularly include maccle diamonds which are capable of being cut in accordance with the method of an aspect of this invention to produce gemstones having improved brilliance with a reduced amount of waste from the uncut stone.
242458
Evans David C.
O'farrell Christopher M.
Robinson Paul
Stanton Ronald T.
Wright Susan L.
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