Process for measuring the surface of a polished precious stone

Details Process for measuring the surface of a polished precious stone Process for measuring the surface of a polished precious stone

2005-03-22

2005-03-22

Evans, F. L. (Department: 2877)

Optics: measuring and testing

Crystal or gem examination

C356S601000, C356S613000

Reexamination Certificate

active

06870606

ABSTRACT:
Process for the measurement of the surface of a polished precious stone, wherein firstly the position of at least some of the flat facet surfaces of the stone is measured in space, in particular by rotating the stone in front of a light source and examination of the shadow cast by the stone, and the facet surface is then observed under direct light.

REFERENCES:
patent: 4529305 (1985-07-01), Welford et al.
patent: 5076698 (1991-12-01), Smith et al.
patent: 6567156 (2003-05-01), Kerner

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