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.

1 . 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, characterised in that each constituent face comprises a third cutting edge extending from the top towards the girdle, a fourth and a fifth cutting edge extending from the first and second star point towards the third cuffing edge, the third, fourth and fifth cutting edge converging into a single first intersection point, the first and the fourth cutting edges defining within the constituent face a first star delimiting facet along a first side of the third cutting edge, the second and fifth cutting edge defining with the constituent face a second star delimiting facet along a second side of the third cutting edge opposite the first star delimiting facet, the fourth and fifth cutting edges defining circumferential facets on a first side of a first striping cutting edge, the first striping cutting edges extending between adjacent first and second star points, a striping facet extending along a second side of the first striping cutting edge opposite the circumferential facet, the striping facets comprising a second striping cutting edge extending from a first star point towards the girdle and a third striping cutting edge extending from a second star point towards the girdle, thus forming concatenated striping facets over the circumference of the pavilion.  
   
   
       2 . The cut gemstone according to  claim 1 , 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  10 , the first and second emphasizing cutting edges converging to each other and intersecting with the third cutting edge at a second intersection point.  
   
   
       3 . The cut gemstone according to  claim 2 , characterised in that each first and second star delimiting facet comprises two emphasizing cutting edges.  
   
   
       4 . The cut gemstone according to  claim 1 , characterised in that the first striping edges form a regular polygon.  
   
   
       5 . The cut gemstone according to  claim 1 , characterised in that the constituent faces are congruent.  
   
   
       6 . The cut gemstone according to  claim 1 , characterised in that the star delimiting facets are congruent.  
   
   
       7 . The cut gemstone according to  claim 1 , characterised in that the star faces are congruent.  
   
   
       8 . The cut gemstone according to  claim 1 , characterised in that the striping facets are congruent.  
   
   
       9 . The cut gemstone according to  claim 1 , characterised in that the second and third striping cutting edges are of substantially equal length.  
   
   
       10 . The cut gemstone according to  claim 1 , characterised in that the pavilion comprises a first axis of symmetry which extends from the culet to the table, having a first symmetry number, and in that the axis of symmetry comprises the culet.  
   
   
       11 . The cut gemstone according to  claim 10 , characterised in that the first symmetry number of the first axis of symmetry equals the number of star points.  
   
   
       12 . The cut gemstone according to  claim 10 , characterised in that the crown comprises a second axis of symmetry which corresponds to the first axis of symmetry of the pavilion.  
   
   
       13 . The cut gemstone according to  claim 10 , characterised in that the table is a regular polygon delimited by a number of table cutting edges equal to the first symmetry number, the cutting edges of the polygon intersecting in respective corners of the polygon.  
   
   
       14 . The cut gemstone according to  claim 13 , characterised in that, when looking through the crown towards the culet, star points lie on a line connecting the intersection of the first axis of symmetry with the table with the corners of the polygon forming the table.  
   
   
       15 . The cut gemstone according to  claim 10 , characterised in that the first symmetry number is three, four, five, six, seven eight or more.