Crown and Pavillion angle and Culet

[diamond island]

I have been read that crown and pavillion angles on all the facets should be as tight/close as possible. Also the culet should be none. For a nice stone. Looking at two stone I have some questions.

Stone 1: Crown angle 33.6-34.0 (the range is only 0.4 degrees, pretty good I guess) Pavillion angle 40.3-41.2 (the range is 0.9 degees off, is this BAD? What should the range be within to one another???

Stone 2: Crown angle 33.8-34.2 (range 0.4 degree) Pavillion angle 40.6-40.9 (range o.3 degree) Is this a better stone than Stone 1???

Also on both of these stones the culet is none on the GIA report but on the sarin Stone 2 reads very small culet. How come the difference between the two? Also is a very small culet bad? What is an ideal Culet?

For the girdle, what is prefered? I thought med to sl. thick is preferred. But is thin to medium necessarily less ideal??

thank you for everyones help.

 

[Garry H (Cut Nut)]

Are you buying a diamond?

 

[diamond island]

Yes. Can you help with my question?

 

[Garry H (Cut Nut)]

It looks more like you want a printed report?

Relax.

 

[pricescope]

Diamond Island,

First of all, none, small or medium culet sizes are just fine. Sometimes small culet is preferable over pointed (none) one because it protects against chipping.

Second, when you look at Sarin numbers for each individual crown and pavilion facet angle, you should take the average of the opposite crown or pavilion angels instead of general deviations.

See Brian’s response in this thread: https://www.pricescope.com/community/threads/diamcalc-request.5104/

So far the numbers for both diamonds do not look like any of them should be rejected.