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How do slight changes in proportions affect a stone's performance?

Linny

Rough_Rock
Joined
Mar 7, 2019
Messages
54
The top is my current stone:

Table 56.7, crown angle 34.6. Pavillion 40.9, LGF 78

verses this one, for example:

Table 55, crown angle 34.3, Pavillion 40.7, LGF 76

How do these changes in proportions affect the stone's performance? I.e. fatter arrows, etc.... I apologize if this is a rudimentary question!
 
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flyingpig

Ideal_Rock
Premium
Joined
Nov 7, 2015
Messages
2,171
The new one has a smaller table, shorter LGF, and shallower pavilion. All of these will make the arrows longer and fatter and the table reflection smaller.

One is not necessarily better than the other. But will there be noticeable difference? I say yes. On side-by-side comparison, you will know which is which.
 

AV_

Ideal_Rock
Joined
Aug 5, 2018
Messages
3,653
I suspect that the difference between those numbers are smaller than the measurements are precise, so they are not telling me that there is any difference between the stones.

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The quetsion remains: if a diamond may loose its brilliance by a .1 or .2 or .3 degrees change of a main angle (in theory, or by recut - if such can be done); I can't think of what you'd have to start with, but remember that the work for the HCA brought up the oddities in theory, & the possibility was ever far off the Ideal beaten track; the good numbers can also stand variations.



@Garry H (Cut Nut)
 
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Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
Aug 15, 2000
Messages
15,156
The new one has a smaller table, shorter LGF, and shallower pavilion. All of these will make the arrows longer and fatter and the table reflection smaller.

One is not necessarily better than the other. But will there be noticeable difference? I say yes. On side-by-side comparison, you will know which is which.
But if they are for earrings or eithr side of another diamond with some slope you will never notice. Both are nice proportions
 
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