Liberty cut gemstone

Abstract

A cut gemstone comprising a girdle, a crown above the girdle and a pavilion below the girdle, the crown comprising a table and the pavilion comprising a culet and a plurality of pavilion faces between the girdle and the culet, the pavilion faces comprising a plurality of constituent faces and a plurality of star faces, the star faces and constituent faces alternating in circumferential direction of the pavilion, each of the constituent faces having a first and a second cutting edge, each star face being delimited from adjacent first and second constituent faces by respectively the first and second cutting edge of the first and second constituent faces respectively, each first cutting edge of a constituent face intersecting with a second cutting edge of a consecutive constituent face thus defining first and second star points respectively, the first and second cutting edges of consecutive constituent faces diverging towards the culet causing the first and second cutting edges of one single constituent face to intersect in a top of the constituent face, the star faces thus defining a visible star-shaped figure between them, the star-shaped figure comprising the culet. The cut gemstone according to the invention has an enhanced brilliance, contrast, fire and scintillation by adding specific facets in the pavilion.

Description

BACKGROUND OF THE INVENTION [0001] The value of gemstones, in particular of gemstones like diamonds, is generally estimated by four determining characteristics, known to the person skilled in the art as: carat, clarity, colour and cut. A common cut is known as the “brilliant cut”, which is a round-shaped cut. The brilliant cut has 58 facets: the table, the culet, 32 crown facets between the table and the girdle and 24 pavilion facets between the girdle and the culet. All the facets are arranged round an eight-fold symmetry axis extending from the culet towards the centre of symmetry of the table. When looking through the table towards the culet a great amount of incident light is internally reflected to a spectator looking through the cut gemstone towards the culet, this effect is known to the person skilled in the art as the brilliance of the stone. When looking through the table towards the culet, no image of a star is reflected towards the spectator. [0002] In another round-shape...

AI Technical Summary

Benefits of technology

[0015] In a preferred embodiment of this invention the cut gemstone is characterised in that the first star delimiting facet comprises at least one first emphasizing cutting edge which extends from the first star point and in that second star delimiting facet comprises at least one second emphasizing cutting edge which extends from the second star point, the first and second emphasizing cutting edges converging to each other and intersecting with the third cutting edge at a second intersection point. Due to the presence of the emphasizing edges, visibility of the reflected star-shaped figure is further increased which allows the star to stand out in the total of the reflections of the cut gemstone. The emphasizing cutting edges also further increase the brightness, contrast, fire and scintillation of the cut gemstone.

[0016] In further preferred embodiments of this invention the cut gemstone according to the invention is characterised in that the first striping edges form a regular polygon, the constituent faces are congruent, the star delimiting facets are congruent, the star faces are congruent, the striping facets are congruent, the second and third striping cutting edges are of equal length, the pavilion comprises an axis of symmetry having a symmetry number and the axis of symmetry comprises the culet, the symmetry number equals the number of star points, the crown has an

Problems solved by technology

The visibility of the star is however connected with a loss of brightness, fire and scintillation of the cut gemstone since the discernability of the star is caused by a darker reflection of the star compared to the surrounding facets, thus decreasing the splendour and value of the cut gemstone.

Other known cut gemstones, for example some designs from the Charles Covill Odds Collection, are simil

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