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Reports. New Parameters

Shape Deviation

The realization of an unattractive girdle shape in a Fancy diamond often comes too late, after the stone has been cut and fails to attract buyers. Operators aiming to increase carat weight may enlarge the girdle shape without having the necessary knowledge and tools to assess its beauty.

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To address this issue, we have developed the Shape Deviation parameters. These parameters help to compare how the girdle shape differs from the ideal shape, just like the 2RRoundness parameter does for the Brilliant cut. The Shape Deviation Grade enables operators to easily reject unacceptable girdle shapes. 

After aligning the girdle shape of the current model with the ideal girdle shape linked to the current cut, we calculate the distances between the two curves. These distances are presented as the Shape Deviation Plot and Shape Deviation Ideal Girdle. Next, we identify azimuth intervals of 11.25, 22.5, 45, and 360 degrees where maximum difference in distances between shapes are observed, and estimate these values. It is in these locations where the imperfections in the girdle shape are most noticeable. The Shape Deviation Plot highlights these areas with rectangular windows, along with indications of global maximum and minimum values.

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Deviations where the current girdle shape is wider or narrower than the ideal shape are color-coded. This information is also depicted in the Shape Deviation Ideal Girdle image. Here, the current model is outlined in black, with areas highlighted in blue and red denoting the extent to which the girdle shape  of the current cut deviates in width from the ideal girdle.

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Global maximum and minimum values are also represented in both pictures.

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The parameter is currently available for the following Octonus cuts:

• Pear_wBT.P24C32
• Pear_PM8_PH26_C32_GWGoldStar
• Marquise_WBT_P24C32_GWGoldStar
• Oval_PM4_PH16_C32_GWGoldStar
• Oval_WBT_PM8_PH16_C32_GWGoldStar
• Heart_PM8_PH18_C35_GWGoldStar

We use classic shapes with different Girdle Ratios as shape references for these cuts. The classic marquise shape consists of two circle arcs. The classic pear shape consists of three circle arcs. The parameter has been integrated into these cuts appraisers in the Absolute Symmetry tab. 

In the reports an ideal ellipse is used as a reference for any сuts recognized as oval and lacking own reference shapes.

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Users can register their cuts with ShapeDeviation control using three new templates "Goodwin_GirdleShape_*". The first registered form will be used as a reference for the ShapeDeviation parameter. Take care in selecting it. For evaluating ShapeDeviation, its Girdle Ratio will be adjusted according to the current solution. In the future, we will enable registering multiple reference shapes and provide tools to assist in selecting reference shapes; ensuring the validity of the user's set of girdle references; creating a girdle reference for the current solution based on the user's multiple references.

One girdle shape reference form does not limit the number of allocation forms. For the algorithms to function correctly, we recommend using allocation forms with an EX grade by Shape Deviation parameters.

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Shape deviation now works on non-convex faces

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SmartRecut controls the new parameter if they are present in the appraiser. There is a comparison of SmartRecut solution with and without using this parameter on the picture. It is important to note that this parameter prevents the continuous deterioration of the girdle shape in the SmartRecut on SmartRecut scenario.

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The parameter has been included into reports: 

• RTF Full report for rounded fancies
• RTF Illustrated report for oval and marquise 
• RTF Illustrated report for rounded fancies 
• HTML Illustrated report for oval and marquise 
• HTML Illustrated report for rounded fancies 
• Export Report Data, Color

In the illustrated reports, the Shape Deviation is located in the bottom right corner. 

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In the full report, this parameter is placed on a separate page.

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The description of Shape deviation parameter and corresponding bookmarks are availbale in Shape Deviation.

The Shape Deviation parameter can be utilized not only for solutions but also for scans of finished diamonds. To do this, select the scan, right-click on the corresponding cut in the "Cut Book," and choose "Link current scan to this appraiser." The scan can then be evaluated in the Appraiser Editor or Polish Report can be built.

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Registration of in-house cuts with ShapeDeviation control

Users can register their in-house cuts with ShapeDeviation control using three new templates "Goodwin_GirdleShape_*". The first registered form will be used as a reference for the ShapeDeviation parameter. Take care in selecting it. For evaluating ShapeDeviation, its Girdle Ratio will be adjusted according to the current solution. In the future, we will enable registering multiple reference shapes and provide tools to assist in selecting reference shapes; ensuring the validity of the user's set of girdle references; creating a girdle reference for the current solution based on the user's multiple references.

One girdle shape reference form does not limit the number of allocation forms. For the algorithms to function correctly, we recommend using allocation forms with an EX grade by Shape Deviation parameters.

Which appraiser tempate to choose?

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The green option is recommended for rounded fancy cuts. The necessity and usefulness of the green option for step cuts are still under question, so both green and yellow options are possible for them.

Image Added AnycutBasic : Goodwin type cuts support AnycutBasic appraiser as well, but with the lack of important advantage of having slope angles in the appraiser.

Image Added Goodwin* : The appraiser control Crown and Pavilion Slopes. The selection of the most important cut facets is performed automatically. The only advantage of this type of templates over other options is the 2C3P version, which is well suited for rectangular cushions with a two-tier pavilion.

Image Added Goodwin_Starts* : The appraiser control Crown and Pavilion Slopes. The selection of the most important cut facets is done by the user using gold and silver stars. This prevents the desynchronization of values at all stages of the diamond's life cycle.

Image Added Goodwin_GirdleShape_Starts* : The appraiser additionally control the Shape Deviation parameter, responsible for the beauty of the girdle shape.

Fixed problems and improvements

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