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公开(公告)号：US10082469B2
公开(公告)日：2018-09-25
申请号：US15739740
申请日：2016-06-28
申请人： De Beers UK Ltd
摘要： A method of and an apparatus for providing an indicator for a diamond as to whether it is natural by testing for the presence or absence of one or more specific markers in the luminescence properties of the diamond. These markers are characterized by luminescence decay time and luminescence wavelength.
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公开(公告)号：US09625393B2
公开(公告)日：2017-04-18
申请号：US14885507
申请日：2015-10-16
申请人： De Beers UK Ltd
CPC分类号： G01N21/87 , G01N21/01 , G01N33/381
摘要： An apparatus for viewing images of a gemstone is described. The apparatus comprises a support structure for supporting the gemstone at an observation position. An illumination structure comprises a plurality of directional light sources directed towards the observation position so as to illuminate the gemstone. The support structure and illumination structure are relatively rotatable relative to one another about a rotation axis. An imaging device is arranged to obtain images of the gemstone at the observation position at a variety of relative rotational positions between the illumination structure and support structure: the imaging device has an imaging axis passing through the observation position. The support structure is arranged so that the gemstone can be placed at the observation position in such a way that the normal to a selected facet of the gemstone is within a range of tilt angles from the rotation axis. The arrangement of directional light sources is such that, for any tilt angle within the range, at least one of the directional light sources will be specularly reflected from the selected facet into the imaging device for at least one rotational position of the support structure.
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公开(公告)号：US11020771B2
公开(公告)日：2021-06-01
申请号：US16337349
申请日：2017-09-28
申请人： De Beers UK Ltd
摘要： An apparatus for sorting gemstones from a batch of gemstones comprises one or more measurement locations, a conveyor comprising a plurality of discrete compartments for containing the gemstones, a delivery device configured to deliver individual gemstones from the batch of gemstones to individual compartments of the conveyor and a controller configured to synchronise a speed of the conveyor with an operation of the one or more measurement locations such that the measurements of the gemstones can be correlated with a location of the gemstones in their associated compartments. A method of sorting gemstones from a batch of gemstones is also disclosed.
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公开(公告)号：US10345245B2
公开(公告)日：2019-07-09
申请号：US16107503
申请日：2018-08-21
申请人： De Beers UK Ltd
摘要： A method of and an apparatus for providing an indicator for a diamond as to whether it is natural by testing for the presence or absence of one or more specific markers in the luminescence properties of the diamond, These markers are characterized by luminescence decay time and luminescence wavelength.
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公开(公告)号：US10215706B2
公开(公告)日：2019-02-26
申请号：US14974425
申请日：2015-12-18
申请人： De Beers UK Ltd.
摘要： A system is described for obtaining images of a gemstone, and performing quantitative analysis on the images to obtain measures of properties of the gemstone. The system comprises a support structure for supporting the gemstone at an observation position. An illumination structure is arranged to illuminate the gemstone. The illumination structure comprises a plurality of radially dispersed directional light sources directed towards the observation position, the support structure and illumination system being rotatable relative to one another around a rotation axis so that the gemstone can be illuminated by one or more of the directional light sources at each of a plurality of rotational positions, the axis of rotation being normal to a selected facet of the gemstone. An imaging device is directed towards the gemstone for obtaining images of the gemstone at each of the rotational positions, the imaging device having an imaging axis parallel to or coincident with the axis of rotation. An image processor is provided for identifying sparkle regions in the images corresponding to reflections from individual light sources by individual facets and providing a quantitative measure of the gemstone on the basis of properties of the sparkle regions.
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