What is spread?

[fletch173]

When I do a search on pricescope, one of the columns that is returned is ''spread''. It seems to range from -4 to +2 based on the results of my particular query. Can someone explain what this means? Thanks,

 

[Lorelei]

Date: 9/24/2008 8:42:41 AM
Author:fletch173
When I do a search on pricescope, one of the columns that is returned is ''spread''. It seems to range from -4 to +2 based on the results of my particular query. Can someone explain what this means? Thanks,

This page explains it for you! http://diamonds.pricescope.com/spread.asp

 

[Finally!]

Lorelei, that page was very informative. Why isn''t this important % included on the GIA report?

Also, the page did not explain what the "Spread" column means by "-4 to +2"? I''m not sure how to interpret this shorthand?

 

[Lorelei]

Date: 9/24/2008 9:59:16 AM
Author: Finally!
Lorelei, that page was very informative. Why isn't this important % included on the GIA report?

Also, the page did not explain what the 'Spread' column means by '-4 to +2'? I'm not sure how to interpret this shorthand?

Ok, the spread column can be explained in these terms as quoted by Garry -


Spread on the PS search by cut- " It is a comparative 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"

So bascially if we consider for explanation purposes a well cut round should have the spread of 6.5mm, then anything above or below that could be -3% or +3%. However well cut stones should have a good spread for the carat weight, so no need to worry too much concerning these variances. Some have said " my diamond is only .75cts but it spreads the same as a 1 carat!" and are pleased about it, however this may not be a good thing as the diamond could well face up larger at the expense of cut quality.