JEWELRY STONE WORKING METHOD Russian patent published in 1997 - IPC

FIELD: jewelry's art. SUBSTANCE: method involves determining minimum and maximum angles α of inclination of main facets of pavilion depending on refractive index n of material to be faceted; selecting angle a of inclination of main facets of bit in accordance with selected angle b of inclination of main facets of pavilion to obtain ranges of possible values of angles a and b of inclination of main facets of pavilion and bit; excluding two of obtained ranges, in which beam radiated from stone is deflected for less than 10 deg from direction of beams falling on facets of bit or platform; selecting from remaining ranges of facet inclination angles the ranges satisfying following conditions: . EFFECT: increased efficiency, improved quality of worked jewelry stone. 7 cl, 10 dwg