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Modified apparatus and method for assessment, evaluation and grading of gemstones

By designing a device that includes a rotating and tilting table, a digital camera and a light source, the subjectivity problem of gem evaluation and valuation is solved, accurate analysis of gem color, cut and other characteristics is achieved, and the fairness and price of transactions are improved. reliability.

Inactive Publication Date: 2011-10-12
OPAL PRODUCERS AUSTRALIA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All directions must be considered in the color judgment, which is difficult due to the limitations of human perception and subjective memory and the variability of vision
[0015] (2) It is difficult to accurately determine the light and shade according to the standard color card when leaving the scene, because the observation conditions are very variable
However, all of these reporting systems use different colorimetric scales, so confusion can arise when considered together

Method used

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Examples

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Embodiment Construction

[0100] about figure 1 With the device 10 shown, the opal can be placed on a table top 11 or on the platform of a goniometer 12, and the table top 11 can be tilted and rotated by the movement of the goniometer, as Figure 6 shown. For the countertop 11, the opal may have a maximum dimension of 5 x 5 x 2 cm. In this specification, the angle of inclination and the angle of rotation are represented by the symbols and θ to represent. When calibrating electronic digital camera 16 and one or more calibrating artificial light sources 14 (see figure 2 ) is located directly above, the horizontal position of the table corresponds to degree readings. From the horizontal position, the table top 11 is tilted away from the one or more light sources 14, so that the reading from degrees down to 0 degrees.

[0101] The device includes a light-tight housing 15, and the relative positions of camera 16, light source 14 and goniometer 12 in the housing are as follows: Figure 4 shown. ...

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PUM

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Abstract

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.

Description

technical field [0001] The present invention relates to apparatus and methods for evaluating, valuing and grading gemstones, including inorganic gemstones and organic gemstones, and ores, such as opals, pearls, diamonds and mineral specimens. In particular, the invention relates to a digital analyzer including hardware and software for these gemstones and ores. [0002] Although the background and preferred embodiments of the present invention are described below with reference to the evaluation, evaluation and grading of opal and other colored gemstones, it will be apparent to those skilled in the art that the invention described is not limited thereto but rather is a broader scope that covers all gems and ores. For ease of understanding, in the specification, the term "precious stone" will be used to represent all precious stones and ores falling within the protection scope of the present invention. [0003] The present invention also relates to apparatus and methods for e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/87
CPCG01N21/87G01N33/389G01N2223/05G01J3/463G01J4/00
Owner OPAL PRODUCERS AUSTRALIA LTD
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