De Beers UK Ltd

De Beers Centenary Ag

Gersan Establishment

Maxwell Ralph Willis

Nicholas Matthew Davies

Siobhan D'Gama

James Gordon Smith

Peter Stanley Rose

Graham Ralph Powell

Keith Barry Guy

Michael John Crowder

Siobhan D'gama

Apparatus and corresponding methods for measuring a plurality of parameters of a cut gemstone while it is positioned at a single measurement location. Apparatus comprise a plurality of light sources, each configured to emit light at a different one of a plurality of emission wavelengths or ranges of wavelengths such that the emitted light illuminates at least part of the measurement location. Apparatus further comprise a sensor assembly configured to sense light at a plurality of sensing wavelengths or ranges of wavelengths for measuring the plurality of parameters. The sensed light is received at the sensor assembly from the measurement location as a result of illumination of a cut gemstone located at the measurement location.

Measuring parameters of a cut gemstone

A method and apparatus for orientating discrete objects, such as gemstones, is described. The method comprises providing the objects on a travelling path; providing a pair of opposed walls () extending generally along the direction of the path; and generating relative oscillatory movement () between the pair of walls () and the travelling path (in a direction generally transverse to the direction of the path), so that the pair of walls () imparts lateral force to the objects to thereby urge them into their most stable orientation as they progress along the path. A device for checking the orientation of the discrete objects is also described.

Automatic gemstone orientation

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Oxfordshire, United Kingdom

Maxwell Ralph Willis