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Spread percentage

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risingsun

Ideal_Rock
Joined
Dec 19, 2006
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5,549
Can someone explain what the +/_ numbers mean? I have read the tutorial, but don''t really understand how the percentages define the spread. I have been looking at some stones and this parameter has me baffled. Thanks for the help.
 

risingsun

Ideal_Rock
Joined
Dec 19, 2006
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5,549
When looking for an ideal cut stone, what range of percentages is acceptable?
 

Bunnifer

Shiny_Rock
Joined
Sep 26, 2006
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227
Date: 1/3/2007 10:59:57 PM
Author: Garry H (Cut Nut)
It is a comparitive figure for the surface area of a stone compared to a Tolkowsky round with a thin girdle.



+1% = a spread that would be 0.01ct bigger for a 1ct size


-15% is very small - and typical for a princess with an appropriate safe girdle thickness for example.
Garry, what is the typical range for surface area percentage in princesses with an appropriate safe girdle thickness? Do many princesses stay true to their ideal diameters (e.g., 6.5mm x 6.5mm for a 1.5 carat princess)?
 
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