Should I Go Under the 1-CT Critical Mark?

[FancyDiamond]

My 1.12 ct RB has been recut per my wish of "doing everything possible but staying above 1 ct". Since it was a very shallow diamond to begin with (crown angle of 31.0 to 31.7 degrees and 60.2% table), it is very difficult to achieve maximum light return and rid of head obstruction without going under the 1-ct mark and more importantly sacrificing much diameter. Now after the recut, I wonder if I should bite the bullet and reduce the diameter further to get a higher crown angle. After all, I have already lost about 0.25mm. May as well lose another 0.10-0.14mm (to a final 6.5mm diameter) and end up with 0.99 ct. Am I being too critical and impractical? Yet, the pinkish (instead of deeper red) center and especially the dark patches (obstruction) bug me a lot. What should I do?

Don''t get me wrong. I am still very pleased with the recut results. The diamond now has symmetry (true hearts and arrows), no more thin girdle, better contrast (helps scintillation) and is brighter (although stone was already a sparkler to start with). I am just wondering if it is a silly idea of mine to stick to the 1-ct mark. What would you do in my situation? Cut down further or stay as is? Currently, my recut stone weighs 1.01 ct with a diameter of 6.64mm. Should I go down to 0.99 ct and a 6.5mm diameter to achieve perfect results (maximum light return and no obstruction)?

 

[tap02150]

i''d go down in size. It is DEFF worth it to go for the optimal light return in sacrifice for .02 ct, which visibly you wont be able to tell the difference in size.

 

[FancyDiamond]

Here is the Diamcalc.

 

[Ellen]

What are you wanting to do with the diamond? If it''s for a ring, I''d probably go for another recut and better performance. If it''s for a pendant, I''d leave it as is.

 

[stone-cold11]

What is the angles now?

I do not see any sign of obstruction in the IS.

 

[D&T]

Date: 9/5/2009 10:51:34 AM
Author: Ellen
What are you wanting to do with the diamond? If it''s for a ring, I''d probably go for another recut and better performance. If it''s for a pendant, I''d leave it as is.

yes, agreed.

definitely think about what you want to do with the diamond before proceeding

 

[ckrickett]

Date: 9/5/2009 11:05:13 AM
Author: D&T

Date: 9/5/2009 10:51:34 AM

Author: Ellen

What are you wanting to do with the diamond? If it''s for a ring, I''d probably go for another recut and better performance. If it''s for a pendant, I''d leave it as is.

yes, agreed.


definitely think about what you want to do with the diamond before proceeding

+1

 

[diagem]

Date: 9/5/2009 10:30:46 AM
Author:FancyDiamond
My 1.12 ct RB has been recut per my wish of ''doing everything possible but staying above 1 ct''. Since it was a very shallow diamond to begin with (crown angle of 31.0 to 31.7 degrees and 60.2% table), it is very difficult to achieve maximum light return and rid of head obstruction without going under the 1-ct mark and more importantly sacrificing much diameter. Now after the recut, I wonder if I should bite the bullet and reduce the diameter further to get a higher crown angle. After all, I have already lost about 0.25mm. May as well lose another 0.10-0.14mm (to a final 6.5mm diameter) and end up with 0.99 ct. Am I being too critical and impractical? Yet, the pinkish (instead of deeper red) center and especially the dark patches (obstruction) bug me a lot. What should I do?

Don''t get me wrong. I am still very pleased with the recut results. The diamond now has symmetry (true hearts and arrows), no more thin girdle, better contrast (helps scintillation) and is brighter (although stone was already a sparkler to start with). I am just wondering if it is a silly idea of mine to stick to the 1-ct mark. What would you do in my situation? Cut down further or stay as is? Currently, my recut stone weighs 1.01 ct with a diameter of 6.64mm. Should I go down to 0.99 ct and a 6.5mm diameter to achieve perfect results (maximum light return and no obstruction)?

How will the cutter achieve blocking (lowering the Diameter by 0.14mm. and then reposition the facet angle and brillianteer all in 0.02ct.?

Or am I missing something?

 

[Tuckins1]

I would do whatever needs to be done to give this stone optimal light performance. If it means being EVER SO SLIGHTLY below the 1ct mark... so be it.

 

[FancyDiamond]

Perhaps I am misinterpreting the images. I thought that the black patches at the base of the arrows were obstruction due to shallow crown angle combines with large table.
I do not have the exact crown angle yet, but guess it is around 32 degrees.

 

[FancyDiamond]

Date: 9/5/2009 10:51:34 AM
Author: Ellen
What are you wanting to do with the diamond? If it''s for a ring, I''d probably go for another recut and better performance. If it''s for a pendant, I''d leave it as is.

I would like to have the choice of setting the diamond in a ring or pendant.
I do not know how to interpret the IS and Diamcalc images. I may be wrong about thinking that there is obstruction from the dark patches around the base of the arrows and that there is not strong light return (pink instead of red center). Thus, I wonder if it is worthwhile to cut further.

 

[diagem]

Date: 9/5/2009 6:04:50 PM
Author: FancyDiamond

Date: 9/5/2009 10:51:34 AM
Author: Ellen
What are you wanting to do with the diamond? If it''s for a ring, I''d probably go for another recut and better performance. If it''s for a pendant, I''d leave it as is.

I would like to have the choice of setting the diamond in a ring or pendant.
I do not know how to interpret the IS and Diamcalc images. I may be wrong about thinking that there is obstruction from the dark patches around the base of the arrows and that there is not strong light return (pink instead of red center). Thus, I wonder if it is worthwhile to cut further.

How about posting a pic of the real McCoy?

 

[stone-cold11]

Those are table reflection.

John explained it in your previous thread where this image is.

Obstruction will see more blue, usually near the arrow head.

 

[stone-cold11]

This thread John explains more. https://www.pricescope.com/community/threads/is-image-questions-yaw.116075/

 

[Jewelove]

I would suggest you to recut it if it is for personal use, whther a ring or anything, but leave it as it is, above the 1 ct. mark if it is as an investment or you wish to resell it in the future.