Method for producing precious or semi-precious stones

Abstract

A method for producing precious or semi-precious stones comprising the following steps is described: cutting and polishing of a rough crystal ( 1 ) so as to obtain a polyhedron of cut crystal ( 2 ); gluing together of at least four polyhedrons ( 2 ) of cut crystal so as to obtain a larger polyhedron ( 4 ); and cutting of the polyhedron ( 4 ) of glued crystals so as to obtain a finished precious or semi-precious stone ( 6 ).

1 . A method for producing precious and semi-precious stones comprising the following steps:
 cutting and polishing of rough crystals ( 1 ) so as to obtain polyhedrons ( 2 ) of cut crystal;   gluing together of said polyhedrons ( 2 ) of cut crystal; and   cutting of the polyhedron ( 4 ) of glued crystals so as to obtain a finished precious or semi-precious stone ( 6 ) comprising a pavilion ( 61 ) and a crown ( 63 ),   
     characterised in that
 at least four polyhedrons ( 2 ) of cut crystal are glued together, wherein at last two polyhedrons ( 2 ) are glued together side by side so as to obtain a larger polyhedron ( 4 ) forming at least one of said pavilion ( 61 ) or said crown ( 63 ). 
 
   
   
       2 . A method according to  claim 1 , characterised in that said gluing step comprises the application of a UV glue and the hardening or the polymerisation of said glue by means of UV irradiation. 
   
   
       3 . A method according to  claim 2 , characterised in that said gluing step comprises the application of a UV-A glue. 
   
   
       4 . A method according to  claim 2 , characterised in that said UV glue is transparent. 
   
   
       5 . A method according to  claim 2 , characterized in that a layer of UV glue having a thickness in the order of a few microns is applied to the faces ( 3 ) of said polyhedrons of cut crystal ( 2 ). 
   
   
       6 . A method according to  claim 1 , characterised in that said cut crystals ( 2 ) are shaped as a prism. 
   
   
       7 . A method according to  claim 1 , characterised in that said cut crystals ( 2 ) are shaped as a cube or a parallelepiped. 
   
   
       8 . A method according to  claim 1 , characterised in that said cut crystals ( 2 ) are shaped as a pyramid. 
   
   
       9 . A method according to  claim 1 , characterised in that said cut crystals ( 2 ) have a carat weight below 5 points. 
   
   
       10 . A method according to  claim 1 , characterised in that said polyhedron ( 4 ) of cut crystals is a cube or a parallelepiped. 
   
   
       11 . A method according to  claim 1 , characterised in that said polyhedron ( 4 ) of cut crystals is a pyramid. 
   
   
       12 . A method according to  claim 1 , characterised in that said polyhedron ( 4 ) of cut crystals comprises twenty-seven cut crystals. 
   
   
       13 . A method according to  claim 1 , characterised in that said polyhedron ( 4 ) of cut crystals has a carat weight of about 240 points. 
   
   
       14 . A method according to  claim 1 , characterised in that said polyhedron ( 4 ) of cut crystals comprises crystals ( 2 ) of the same nature. 
   
   
       15 . A method according to  claim 1 , characterised in that said polyhedron ( 4 ) of cut crystals comprises crystals ( 2 ) of different natures. 
   
   
       16 . A method according to  claim 1 , characterised in that said finished precious or semi-precious stone ( 6 ) comprises, a girdle ( 62 ) between said pavilion ( 61 ) and said crown ( 63 ). 
   
   
       17 . A method according to  claim 16 , characterised in that the crown ( 63 ) of said finished precious or semi-precious stone is cut with a faceted or mixed cut. 
   
   
       18 . A method according to  claim 1 , characterised in that said finished precious or semi-precious stone is cut with a cabochon cut. 
   
   
       19 . A finished precious or semi-precious stone ( 6 ) comprising a pavilion ( 61 ) and a crown ( 63 ), characterised in that it comprises at least four polyhedrons ( 2 ) of cut crystal glued together, wherein at last two polyhedrons ( 2 ) of cut crystal are glued together side by said so as to obtain a larger polyhedron ( 4 ) and so as said pavilion ( 61 ) or said crown ( 63 ) comprises at last two polyhedrons ( 2 ) of cut crystal glued together side by said. 
   
   
       20 . A finished precious or semi-precious stone ( 6 ) according to  claim 19 , characterized in that it further comprising a girdle ( 62 ) between said pavilion ( 61 ) and said crown ( 63 ).