System and method for computerized evaluation of gemstones
a computer-based system and gemstone technology, applied in the field of gemstones, can solve the problems that the tokowsky model does not account for differences or variations in facet types, sizes or positions, and the lighting model, therefore, has some shorfalls, so as to achieve the effect of accurate measurement of composite brilliance of a gemston
Inactive Publication Date: 2014-06-24
DIAMOND TECH
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AI Technical Summary
Benefits of technology
The patent text describes a method for determining the grade of a gemstone by analyzing the way light spreads throughout it. This allows for a more accurate measurement of the brightness and quality of the gemstone. The technical effect is an improved way of evaluating and grading gemstones.
Problems solved by technology
Although Tolkowsky's cut represented a milestone in the industry, it is based upon a two-dimensional profile, and so does not account for three-dimensional reflective and refractive effects.
Furthermore, the Tokowsky model doesn't account for differences or variations in facet types, sizes or positions, or assymetries present in some cuts.
This lighting model, therefore, has some shorfalls due to the fact that an actual gemstone is normally illuminated from a myriad of directions.
Method used
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1.0 Overview and Discussion of the Invention
[0071]The present invention is directed toward a system and method for modeling and evaluating the propagation of light through an optical system. More specifically, in a preferred embodiment, the present invention provides a system and method for evaluating properties of a gemstone using a gemstone model. A key feature of the invention is that it provides a computer-based system and method for evaluating and grading the cut of a gemstone which can be used for determining an ideal or near-ideal cut. Thus, the invention can be used to grade the cut of an existing cut stone or to determine ideal dimensions for a stone to be cut.
[0072]Generally speaking, in accordance with the invention, data on the stone to be evaluated is collected into a data set. The data in the data set includes the material characteristics of the stone. This data also includes cut data, such as information regarding an existing cut or a proposed cut. The cut data can in...
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A system and method for computerized grading of the cut of a gemstone. The system includes a gemstone model and an illumination model. The gemstone model defines the cut of the gemstone in three dimensions with reference to the facets of the gemstone. The illumination model defines light projected onto the gemstone. The method includes the steps of determining a beam of light refracted into the gemstone from the illumination model for at least one of the facets, tracing reflections of the beam of light within the gemstone, and measuring at least one light beam refracted out of the gemstone model. The measurements of the refracted light are used to evaluate the gemstone.
Description
BACKGROUND OF THE INVENTION[0001]1.0 Field of the Invention[0002]This invention relates generally to gemstones, and more particularly to a computer-based system and method for evaluation of a gemstone by modeling light propagating through the gemstone.[0003]2.0 Related Art[0004]Very few subjects have plagued the diamond industry more than the subject of cut. The basis for conventional cut grading of gemstones was established in 1919 by Marcel Tolkowsky, an industrious Antwerp diamond cutter. In his mathematical dissertation entitled “Diamond Design, A Study of the Reflection and Refraction of Light in a Diamond,” Tolkowsky established mathematically an optimal brilliant cut for a diamond that is still widely used today. The Tolkowsky cut defined certain dimensions (that is, table diameter, crown height and pavilion depth) of the diamond as percentages of its girdle diameter. Thus, the Tolkowsky cut is scalable, and so can be used for a different sizes of this style of cut.[0005]Alth...
Claims
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Login to View More IPC IPC(8): G01N21/00G01N21/87
CPCG01N21/87
Inventor SHANNON, SR., PAUL T.
Owner DIAMOND TECH