ChunkyCushionLover
Ideal_Rock
- Joined
- Jun 21, 2009
- Messages
- 2,463
Dear PSers,
Recently I was asked to grade 2 diamonds in the MSS fire series 17,18 found here http://www.octonus.com/oct/mss/. Although I am not a grader most of the information about these stones is available including Helium Scan Data, Actual Idealscope Images, DiamCalc evaluation based on Helium scan, .gem files and GIA and AGS-PGS grading so I could simple comment on the wealth of information already available.
These designs developed by starting with AGS0 near Tolkowsky Ideal Cut and then some proportions were varied like Crown Angle, Pavillion Angle and Lower Girdle Facets, Star facets to develop a design thought to maximize fire more so than the well balanced Hearts and Arrows TICs that we general see sold and often reccomended here.
First I looked at the .gem files under various lighting and tilt angles and finally the actual Idealscope image which confirmed what I was seeing some assymetry and leakage under the table.
My first thought was why does any new diamond design optimized for fire have to be assymetric and contain leakage under the table surely a better design is possible??
These were designed over two years ago what does the most modern FIC look like?
Karl K has suggested a rough limit of 50T/80lgf/37c/40.5P/45 stars as a close to the edge of a well balanced FIC.
Has anyonel tried to optimize the steeper crown and balance the tradeoffs using DiamCalc?
What would be the limit of an FIC given that the sacrifice in brilliance, and leakage and spread cannot be too great. Please support by a real diamond or at least a theoretical picture and images of the proposed FIC.
I also hope people would answer the following as well?
i) Is there an acceptable way to measure fire experimentally? If so how?
ii) Theoretically for cut design is it enough to use the Dispersion in DiamCalc or what else would need to be used?
iii) Do consumers really care about the intensity of fire or just the size of the flash? Is this the major drawback to marketing and selling this type of diamond or is it just the loss of spread and weight that are the most important factors preventing this type of diamond from being more common?
Recently I was asked to grade 2 diamonds in the MSS fire series 17,18 found here http://www.octonus.com/oct/mss/. Although I am not a grader most of the information about these stones is available including Helium Scan Data, Actual Idealscope Images, DiamCalc evaluation based on Helium scan, .gem files and GIA and AGS-PGS grading so I could simple comment on the wealth of information already available.
These designs developed by starting with AGS0 near Tolkowsky Ideal Cut and then some proportions were varied like Crown Angle, Pavillion Angle and Lower Girdle Facets, Star facets to develop a design thought to maximize fire more so than the well balanced Hearts and Arrows TICs that we general see sold and often reccomended here.
First I looked at the .gem files under various lighting and tilt angles and finally the actual Idealscope image which confirmed what I was seeing some assymetry and leakage under the table.
My first thought was why does any new diamond design optimized for fire have to be assymetric and contain leakage under the table surely a better design is possible??
These were designed over two years ago what does the most modern FIC look like?
Karl K has suggested a rough limit of 50T/80lgf/37c/40.5P/45 stars as a close to the edge of a well balanced FIC.
Has anyonel tried to optimize the steeper crown and balance the tradeoffs using DiamCalc?
What would be the limit of an FIC given that the sacrifice in brilliance, and leakage and spread cannot be too great. Please support by a real diamond or at least a theoretical picture and images of the proposed FIC.
I also hope people would answer the following as well?
i) Is there an acceptable way to measure fire experimentally? If so how?
ii) Theoretically for cut design is it enough to use the Dispersion in DiamCalc or what else would need to be used?
iii) Do consumers really care about the intensity of fire or just the size of the flash? Is this the major drawback to marketing and selling this type of diamond or is it just the loss of spread and weight that are the most important factors preventing this type of diamond from being more common?