PRECIOUS STONE AND METHOD OF ITS FACETING Russian patent published in 2009 - IPC A44C17/00 

FIELD: items of private and domestic use.

SUBSTANCE: it is received blank of cubic form stone, which is fixed by means of binder in mandrel with peg-shaped jack, so that blank vertex match to the bottom of jack, and its ribs rest walls of jack. Than mandrel is fixed in collet of faceting head and blank is treated according to selected shape of faceting, herewith ajoint of corona and pavilion of stone there are implemented three arched ribs. Precious stone is received from of square blank, contains located in several layers or belts angularly related to each other verges, forming corona and pavilion, at joint of which there are formed three arched ribs.

EFFECT: material saving, essential simplification of stone process technology.

16 cl, 20 dwg, 3 tbl