Modified apparatus and method for assessment, evaluation and...

G - Physics – 01 – N

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G01N 21/87 (2006.01)

Patent

CA 2739721

An apparatus (10) for assessment, evaluation and grading of gemstones has a stage (11) upon which a gemstone may be supported. The stage is enclosed in a housing (15) that is impervious to light. There is at least one light source (14) located in the housing which is adapted to project incident light onto the gemstone. Means for rotating and tilting the stage so as to vary the orientation of the gemstone to the incident light are also present. A digital camera (16) is located in the housing adjacent the or each light source and is adapted to take images of the gemstone based on reflection and/or refraction of the incident light. The apparatus also includes information processing means for calibrating and analysing the images. The information processing means is programmed with instruction sets for assessing one or more of colour, cut, clarity, scintillation, brilliance, lustre, dispersion and sheen. The gemstone is supported upon the stage by securing means (17) engaging the gemstone at its bottom surface.

L'invention porte sur un appareil (10) pour l'estimation, l'évaluation et le classement de pierres précieuses, lequel appareil a une platine (11) sur laquelle une pierre précieuse peut être supportée. La platine est renfermée dans un boîtier (15) qui est imperméable à la lumière. Il y a au moins une source de lumière (14) située dans le boîtier qui est apte à projeter une lumière incidente sur la pierre précieuse. Des moyens pour faire tourner et incliner la platine de façon à faire varier l'orientation de la pierre précieuse à la lumière incidente sont également présents. Un appareil photo numérique (16) est situé dans le boîtier adjacent à la ou à chaque source de lumière et est apte à prendre des images de la pierre précieuse sur la base de la réflexion et/ou réfraction de la lumière incidente. L'appareil comprend également un moyen de traitement d'informations pour étalonner et analyser les images. Le moyen de traitement d'informations est programmé avec des ensembles d'instruction pour estimer un ou plusieurs éléments parmi la couleur, la coupe, la clarté, la scintillation, la brillance, le lustre, la dispersion et le reflet. La pierre précieuse est supportée sur la platine par un moyen de fixation (17) en prise avec la pierre précieuse sur sa surface inférieure.

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