Gemstone viewer

A technique for gemstones, observation positions, used in instruments, testing jewelry, scientific instruments, etc.

Inactive Publication Date: 2011-10-12
DE BEERS UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been found that for most gemstones, the use of highly symmetrical lighting pa

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0099] assembled roughly according to figure 1 experimental equipment. The base 101 is made of aluminum alloy plate, and the support member 102 and other components are made of aluminum alloy extrusions, brackets and the like. The support member 102 is inclined at an angle of 5° relative to the vertical.

[0100] The linear slide 103 was supplied by Aerotech Limited as a Reading Uk-type ATS 302MM with a stroke of 50mm. This was powered by a size 23 stepper motor and SimStep single axis stepper motor system supplied by McLennan Servo Power Ltd in Surrey UK. The SimStep single axis is controlled via an RS232 interface from an IBM personal computer (PC).

[0101] The rotary table 104 was assembled by mounting a rigid disk of high density polyurethane foam on the output shaft of a Maxon 2325.915-11.111 DC motor equipped with a reduction gearbox with a reduction ratio of 400:1. Motor speed and direction were manually controlled with a voltage control knob and polarity reversing...

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PUM

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Abstract

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.

Description

technical field [0001] The present invention relates to apparatus and methods for viewing gemstones. In particular, though not exclusively, the invention relates to the play of light for viewing gemstones and indicia inscribed on the surface of gemstones. Background technique [0002] The beauty or attractiveness of gemstones, and especially diamonds, is believed to be directly linked to how gemstones interact with light. This interplay is known as the "play of light" and incorporates properties such as brilliance, fire and scintillation exhibited by gemstones. Brilliance relates to the intensity and contrast of light returned by the gemstone to the observer, fire relates to the amount of dispersed light returned by the gemstone, and scintillation relates to the incidence of flashes of light visible to the observer as the gemstone moves relative to the light source. [0003] Recently, the practice of engraving gemstones with trademarks, identification numbers, and / or indic...

Claims

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Application Information

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IPC IPC(8): G01N21/87
CPCG01N21/87G01N33/381G01N21/01
Inventor 迈克尔·皮特·豪克罗杰詹姆士·戈登·查特斯·史密斯皮特·斯坦利·罗斯
Owner DE BEERS UK LTD
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