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Overview

The SweetLine parameter description, information about its calculation, and presence in appraisers and reports is presented on the SweetLine page.

For Round Brilliant, Oval

Parameter Usage

Using the SweetLine parameter, you can achieve better optical performance for the solutions. Smaller values of SweetLine would cut out a stripe from the rectangle, potentially enabling the search for favorable solutions over a wide range of parameters. Previously this area could only be covered by a series of smaller rectangles, that is, by running the search multiple times with extremely tightened CrownAngle and PavilionAngle, each time covering a small portion of the stripe. Sweetline offers a less time-consuming alternative to this approach.

The default EX boundaries for SweetLine is from -1.5 to 1.5. Boundaries both for EX and for all other grades can be changed and saved in editable profiles.

While comparing the Smart Recut solutions making use of SweetLine, keep in mind the following features:

  • Changing the SweetLine parameter does not necessarily affect the solutions. If a solution found with default SweetLine happened to fall close enough to the optimal line, then the search with lowered SweetLine might end up in the same solution.
  • The MaxMass preset takes into account neither the CrownAngle and PavilionAngle nor SweetLine limitations.

Overview Video

Video | SweetLine - Time-Saving Approach to Getting Better Optical Performance
Published:2019, October 1Last Updated: 2019, December 5v.2.0

Video summary:

  • CrownAngle = 34.5 and PavilionAngle = 40.75 named Tolkowsky Point provide the best optical performance

  • Brilliants belonging to axis going through Tolkowsky Point with the negative slope 1:6 also provide excellent optical performance

  • The SweetLine parameter sticks solutions to this axis

  • There are two ways of using SweetLIne: via SweetLine profile or using your own editable profile with SweetLine, CrownAngle and PavilionAngle set to your needs

Video keywords: SweetLine, SweetLIne axis, optical performance, CrownAngle, PavilionAngle

Published in:Release Notes2019-10-23 - HPOxygen Server 5.3.42
DocumentationUsing SweetLine
PlaylistsAll Videos
AlsoAs Separate Page | Specification

Example - Rough Stone

Here is an example of rough stone (0041_4.90ct.Mmd_modern.oxg) with two sets of Smart Recut solutions. Note how the tightened setting of SweetLine leads to the improved visual appearance (the "hearts and arrows" pattern) and greater values of light return.

 

Yellow Flags = SR above solution #1, Modern_Cut with Table EX = [54 60] 
Green Flags = the same with SweetLine EX = [-0,3 0,3]

Preset

-

-


Original stone18. SemipolishedSeries 1 (Default SweetLine = 1,5)

Mass4.89631.76621.81041.80821.80741.80551.80391.80181.7958
Optical symmetryNA8.056.006.737.107.567.747.938.22
CrownAngle,
PavilionAngle

NA

34.69
41.24

35.20
41.65

35.20
41.65
35.20
41.65
35.20
41.65
35.20
41.65
35.20
41.65
35.20
41.65
Light returnNA
0.900.870.870.850.870.880.89
Picture







NA






Series 2 (SweetLine = 0,3) 

Mass1.80201.79971.79801.79531.79001.78901.7817
Optical symmetry5.465.575.836.237.637.148.17

CrownAngle,
PavilionAngle

35.70
40.85
35.70
40.85
35.70
40.85
35.70
40.85
35.20
40.65
34.70
41.01
35.20
40.65
Light return0.980.991.001.010.991.020.99
Picture

Light return is currently not included in HPO reports. It may be obtained via DiamCalc. To open a model in DiamCalc, export it from HPO using File → Export → Diamond to dmc file.

Note that the MaxMass preset is excluded from the comparison.

Example - Semipolished Stone

Below is an example of a semipolished stone (Sweetline_example_2 (SL Updated Results).oxg) with two sets of Smart Recut solutions. Note how the tightened setting of SweetLine leads to the improved visual appearance (the "hearts and arrows" pattern) and greater values of light return. 

Yellow Flags = SR above solution #2, Modern_Cut with Table EX = [54 60] 
Green Flags = the same with SweetLine EX = [-0,3 0,3]

Preset

-

-


Original stone18. SemipolishedSeries 1 (Default SweetLine = 1,5)

Mass1.37361..11251.13751.13631.13181.13411.13331.13241.1295
Optical symmetry

5.045.976.947.367.618.158.43
CrownAngle,
PavilionAngle



35.20
41.65

35.20
41.65
34.20
41.85
34.70
41.45
34.70
41.45
33.70
41.85
33.70
41.85
Light return

0.910.910.930.950.950.940.95
Picture










Series 2 (SweetLine = 0,3) 

Mass1.13041.12971.12931.12771.12621.12421.1212
Optical symmetry5.106.386.847.157.417.508.39

CrownAngle,
PavilionAngle

35.20
40.85
35.20
40.85
35.20
40.85
35.20
40.85
35.20
40.85
35.20
40.85
35.20
40.85
Light return0.970.970.970.970.970.980.99
Picture

For AnyCut

Specifying Unique SweetLine Slope for Client Cuttings

For each of the Client Cuttings, you can specify a unique SweetLine axis slope using its allocation forms (for information about user cuttings and allocation forms, see  In-house cut registration ). There are three ways of how SweetLine axis slope is specified for the cutting:

  • The user did not specify any specific forms: the SweetLine axis is built using the base allocation form of the cutting - the system uses this form and draws a line through it in accordance with the built-in system logic for finding optimal optical performance.

     About base allocation form

    What is a base allocation form? It is the form automatically registered when performing In-house cut registration (equal to the model being registered as cutting).

    How to distinguish the base allocation form? In the list of forms, it does not have "(...)" after its name:

  • The user specified only one form: the SweetLine axis is built using this form - the system uses this form and draws a  line through it in accordance with the built-in system logic for finding optimal optical performance.
  • The user specified two forms: the SweetLine axis is built using these forms - the system draws a  line through them.

To specify forms for SweetLine for your cutting:

  1. Show allocation forms of your cutting as described here.
  2. Right-click the appropriate allocation form and select Sweetline anycut: set first point of line

     

  3. If necessary, select another allocation form and select  Sweetline anycut: set other point of line . 

    The selected points are marked in the Allocation column as "SL1" and "SL2". 

     
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