Diamond dimensions- is this a good diamond?

[outlier22]

Hello, I am new to this site. My fiance and I purchased my e-ring over the weekend. It''s EGL-USA certified. I am not very well-informed about the dimensions of a diamond so just wanted to ask for your opinion:

weight: 1.27 CT
measurements: 6.91-6.90*4.25 mm

depth: 61.5%
table: 60%
crown: 14.5%
pavillion: 43.0%
girdle: medium to thick faceted
culet: none
clarity: SI2
Color grade: F
Fluorescence: Medium Blue
Polish: Very good
Symmetry: Very good.

I don''t know how to really read this. I know about the 4C''s but not the rest of it. What do you think?

 

[stone-cold11]

Nope from the % numbers you gave but angles work better.

https://www.pricescope.com/cutadviser.asp

The girdle is also thick, making the stone look smaller than what it should be. Should be around 7mm instead of 6.9mm.

 

[Dreamer_D]

I''m sorry, but the angles are not ideal at all. This diamond will probably not be the best performer in terms of light return.

EGL is also more liberal in its grading that GIA or AGS, so it is most likely not a "true" F SI2. It may be up to 2 grades lower on either dimension. However, EGL-USA is the best of the EGL labs, so perhaps this grading is not too far off.

What did you pay for the diamond? If it was a *very* good price then you may want to accept these facts about the stone, since getting a better cut or a GIA/AGS report will cost more.

But I am sorry to say I personally would return the diamond and look for one with a better cut, most importantly. I am willing to bet you overpaid if you bought it in a B&M store.

 

[outlier22]

We bought it in Diamond district in NY and paid $5000.

 

[Dreamer_D]

Diamonds graded by EGL of those specs seem to go between $2800 and $4500, depending on cut quality and other factors. So you paid at the higher end for what you got, but not completely out of the ball park.

Can you return it? If it were me I would return it and get a smaller lower color diamond with a GIA cert and a much better cut from an online vendor, but obviously the decision is yours.

 

[outlier22]

I am planning a trip back to Diamond district today- could you tell me so what measurements would be ideal? I read the explanation on the cut but how should they be with respect to each other? I mean the proportions of crown and pavillion angles, table and depth %?

 

[Lorelei]

Date: 2/4/2010 9:56:41 AM
Author: outlier22
I am planning a trip back to Diamond district today- could you tell me so what measurements would be ideal? I read the explanation on the cut but how should they be with respect to each other? I mean the proportions of crown and pavillion angles, table and depth %?

You can use this chart as a guide along with the Holloway Cut Advisor, aim for diamonds which score below 2.

depth - 60 - 62% - although my personal preference is to allow up to 62.4%
table - 54- 57%
crown angle - 34- 35 degrees
pavilion angle - 40.6- 41 degrees
girdle - avoid extremes, look for thin to slightly thick, thin to medium etc
polish and symmetry - very good and above

note - with crown and pavilion angles at the shallower ends ( CA 34- PA 40.6) and steeper ( CA 35- PA 41) check to make sure these angles complement in that particular diamond - eyeballs, Idealscope, trusted vendor input - check as appropriate!

As the above implies, configurations depend on each other. A little give here can still work with a little take there.

From expert John Pollard.

With that said, here's a "Cliff's Notes" for staying near Tolkowsky/ideal angles with GIA reports (their numbers are rounded): A crown angle of 34.0, 34.5 or 35.0 is usually safe with a 40.8 pavilion angle. If pavilion angle = 40.6 lean toward a 34.5-35.0 crown. If pavilion angle = 41 lean toward a 34.0-34.5 crown.

GIA "EX" in cut is great at its heart, but it ranges a bit wider than some people prefer, particularly in deep combinations (pavilion > 41 with crown > 35).

 

[Todd Gray]

Date: 2/4/2010 9:56:41 AM
Author: outlier22
I am planning a trip back to Diamond district today- could you tell me so what measurements would be ideal? I read the explanation on the cut but how should they be with respect to each other? I mean the proportions of crown and pavillion angles, table and depth %?

There are a couple of well known vendors from PS located within the district, I don''t believe that I can mention them by name without violating the "direct referral" concept of the forum rules - but run a search through the vendor list located under the Resources tab and then set up an appointment to go see them... They will definitely understand the concept of "ideal" and will be able to provide you with a much better experience than you''re going to get "on the street" at the hands of all the "barkers"...

 

[Dreamer_D]

ID Jewelry is there and I have heard great things about them. James Allen (they have an office, you need an appointment) and Engagement Rings Direct are also there. Not sure of others... You need appintments with all of them I think.

 

[Lorelei]

Date: 2/4/2010 3:26:15 PM
Author: dreamer_dachsie
ID Jewelry is there and I have heard great things about them. James Allen (they have an office, you need an appointment) and Engagement Rings Direct are also there. Not sure of others... You need appintments with all of them I think.

Also www.exceldiamonds.com

 

[stone-cold11]

Also, you may skip out to GoodOldGold in Long Island.

I think almost all of them requires appointment in advance, so call.

 

[Lorelei]

Date: 2/4/2010 4:26:28 PM
Author: Stone-cold11
Also, you may skip out to GoodOldGold in Long Island.

I think almost all of them requires appointment in advance, so call.

Yes they do all need an appointment so good advice to call in advance.