Centering and working gemstones

Details Centering and working gemstones Centering and working gemstones

1981-06-01

1983-11-29

Whitehead, Harold D.

Stone working

Precious stone working

356 30, 5116572, B28D 500

Patent

active

044175647

ABSTRACT:
A rough gem stone is centered by mounting the stone on a dop, providing an image of the stone, as seen normal to the axis, providing a reference shape which corresponds to the shape of a cut stone, and superimposing the stone image and the reference shape, altering the size of one relative to the other until the reference shape corresponds to the stone that can be cut from the rough stone, and altering the position of the rough stone until the stone image registers correctly with the reference shape. In a method of working the stone, the final radial dimension to which the stone is to be worked is estimated and is used for terminating working when the actual radial dimension reaches the corresponding value.

REFERENCES:
patent: 3035480 (1962-05-01), Teucher

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