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

[0005] The present invention seeks to add improvements to the existing gemstones and aims at providing a cut gemstone in which a figure resembling a star is reflected clearly visibly towards the spectator with an enhanced brilliance.

[0018] The reflection of the striping cutting edges, star faces and star delimiting facets by incident rays of light is also improved due to the higher degree of symmetry, thus adding to the visibility of the star-shaped figure and the striping effect by reflecting the star-shaped figure and the striping cutting edge directly to the spectator or by causing secondary reflections.

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 similar to the cut as disclosed in the preamble but the cut gemstone has a reduced brilliance and the image of the star is not clearly reflected towards the spectator looking into the cut gemstone, the reflection of the star is for example distorted by the many facets comprised in the crown of the cut gemstone, making it impossible to distinguish a reflected star-shaped figure in the many reflections.

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