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Advice on 3 different Stones

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stonesour

Rough_Rock
Joined
Feb 25, 2009
Messages
5
I would like some opinions regarding the 3 stones shown below.

What is the best deal? Is the price quoted a good price? Which one would you buy? They are of different sizes, clarity and color but all very well cut stones.

Stone 1 - Whiteflash 4 Star Rating $6379
. Report: GIA
. Shape: Round
. Carat: 1.27
Color – G
Clarity SI 2
. Depth %: 61.9
. Table %: 57
. Girdle: TN-M/F
. Measurements: 6.91-6.99X4.30
. Polish: Excellent
. Symmetry: Excellent
. Culet: None
. Fluorescence: None

Stone 2 - Local Merchant - $5200

Report Type: GIA Diamond Grading Report
Date of Issue: March 03, 2008
Round Brilliant
Measurements: 6.40 - 6.42 x 3.95 mm
Carat Weight: 1.01
Color Grade: H
Clarity Grade: SI1
Cut Grade: Very Good
Proportions:
Depth: 61.6 %
Table: 58 %
Crown Angle: 34.5°
Crown Height: 14.5 %
Pavilion Angle: 40.8°
Pavilion Depth: 43 %
Star length: 50 %
Lower Half: 80 %
Girdle: Medium to Thick, Faceted
Culet: None
Finish:
Polish: Very Good
Symmetry: Very Good
Fluorescence: Faint

Stone 3 - Local Merchant - $5500
EGL USA
Stone 87927602D
Weight 1.15 CT
Shape ROUND BRILLIANT
Color H
Clarity SI1
Cut Grade IDEAL PLUS H&A
Measurements 6.74 x 6.7 x 4.09 mm
Depth 60.9%
Table 58%
Crown 14.9%
Pavilion 42.3%
Crown Angle 35.6°
Pavilion Angle 40.4°
Girdle THIN TO SL. THICK
Polish VERY GOOD
Symmetry VERY GOOD
Fluorescence FAINT
Culet N/A
Comments
UGS Appraisal Value $12490.00

Thanks, StoneSour
 

Lorelei

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
42,064
Date: 3/2/2009 12:24:19 PM
Author:stonesour
I would like some opinions regarding the 3 stones shown below.

What is the best deal? Is the price quoted a good price? Which one would you buy? They are of different sizes, clarity and color but all very well cut stones.

Stone 1 - Whiteflash 4 Star Rating $6379
. Report: GIA
. Shape: Round
. Carat: 1.27
Color – G
Clarity SI 2
. Depth %: 61.9
. Table %: 57
. Girdle: TN-M/F
. Measurements: 6.91-6.99X4.30
. Polish: Excellent
. Symmetry: Excellent
. Culet: None
. Fluorescence: None

Stone 2 - Local Merchant - $5200

Report Type: GIA Diamond Grading Report
Date of Issue: March 03, 2008
Round Brilliant
Measurements: 6.40 - 6.42 x 3.95 mm
Carat Weight: 1.01
Color Grade: H
Clarity Grade: SI1
Cut Grade: Very Good
Proportions:
Depth: 61.6 %
Table: 58 %
Crown Angle: 34.5°
Crown Height: 14.5 %
Pavilion Angle: 40.8°
Pavilion Depth: 43 %
Star length: 50 %
Lower Half: 80 %
Girdle: Medium to Thick, Faceted
Culet: None
Finish:
Polish: Very Good
Symmetry: Very Good
Fluorescence: Faint

Stone 3 - Local Merchant - $5500
EGL USA
Stone 87927602D
Weight 1.15 CT
Shape ROUND BRILLIANT
Color H
Clarity SI1
Cut Grade IDEAL PLUS H&A
Measurements 6.74 x 6.7 x 4.09 mm
Depth 60.9%
Table 58%
Crown 14.9%
Pavilion 42.3%
Crown Angle 35.6°
Pavilion Angle 40.4°
Girdle THIN TO SL. THICK
Polish VERY GOOD
Symmetry VERY GOOD
Fluorescence FAINT
Culet N/A
Comments
UGS Appraisal Value $12490.00

Thanks, StoneSour
Hi SS,

First diamond from WF - do you have the crown and pavilion angles please, and any images such as ASET if it is an in house diamond? You will need to check carefully with WF that it is eyeclean to your standards.

Second diamond - looks promising from the proportions.

Third diamond - EGL USA is said to be the strongest of the EGL labs - a point to mention that the cut adjective Ideal Plus is no guarantee of a well cut diamond. The pavilion angle is a bit shallower than I prefer so ideally I would like an ASET image for this diamond, but as it is from a jewellery store this is probably not possible regrettably.

From the info we have, so far the second diamond looks the most promising to me.
 

Ellen

Super_Ideal_Rock
Joined
Jan 13, 2006
Messages
24,426
Yep, what she said.
 

stonesour

Rough_Rock
Joined
Feb 25, 2009
Messages
5
I have received more information on the WF diamond. Thanks for all your help.

GIA 297815001

Stone 1 - Whiteflash 4 Star Rating $6379
. Report: GIA
. Shape: Round
Measurements 6.91-6.99x4.30mm
. Carat: 1.27
Color – G
Clarity SI 2
Cut Grade Excellent
. Depth %: 61.9
. Table %: 57
crown angle 35.5 degrees
crown 15.5%
Pavilion Angle 41.0 degrees
pavillion 43.0%
. Girdle: TN-M/F
. Measurements: 6.91-6.99X4.30
. Polish: Excellent
. Symmetry: Excellent
. Culet: None
. Fluorescence: None
 

Stone-cold11

Super_Ideal_Rock
Joined
Sep 9, 2008
Messages
14,069
Date: 3/2/2009 5:33:41 PM
Author: stonesour
I have received more information on the WF diamond. Thanks for all your help.

GIA 297815001

Stone 1 - Whiteflash 4 Star Rating $6379
. Report: GIA
. Shape: Round
Measurements 6.91-6.99x4.30mm
. Carat: 1.27

Color – G
Clarity SI 2
Cut Grade Excellent
. Depth %: 61.9
. Table %: 57
.crown angle 35.5 degrees
.crown 15.5%
.Pavilion Angle 41.0 degrees
.pavillion 43.0%
. Girdle: TN-M/F
. Measurements: 6.91-6.99X4.30
. Polish: Excellent
. Symmetry: Excellent
. Culet: None
. Fluorescence: None
From these numbers, stone 1 doesn''t look that good.

Prefer #2.
 

Ellen

Super_Ideal_Rock
Joined
Jan 13, 2006
Messages
24,426
Ditto, the second stone has better angles. I''d get an IS on it.
 

phildominator

Rough_Rock
Joined
Feb 20, 2009
Messages
63
Date: 3/2/2009 6:06:22 PM
Author: Stone-cold11
Date: 3/2/2009 5:33:41 PM

Author: stonesour

I have received more information on the WF diamond. Thanks for all your help.


GIA 297815001


Stone 1 - Whiteflash 4 Star Rating $6379

. Report: GIA

. Shape: Round

Measurements 6.91-6.99x4.30mm

. Carat: 1.27


Color – G

Clarity SI 2

Cut Grade Excellent

. Depth %: 61.9

. Table %: 57

.crown angle 35.5 degrees

.crown 15.5%

.Pavilion Angle 41.0 degrees

.pavillion 43.0%

. Girdle: TN-M/F

. Measurements: 6.91-6.99X4.30

. Polish: Excellent

. Symmetry: Excellent

. Culet: None

. Fluorescence: None
From these numbers, stone 1 doesn''t look that good.


Prefer #2.
On the HCA, this stone gets a 3.9. Just changing the crown angle from 35.5 to 35, HCA score is 2.4.
Change the crown angle to 34.5 and HCA is 1.9.

HCA significantly penalizes this stone for a 1.0 degree difference in Crown Angle.

Question #1 - How precise are these "35.5" measurements? Could the tolerance vary 0.5 degrees?

Question #2 - The HCA score significantly differs with the 1.0 degree change...Does this accurately reflect actual performance difference in a diamond 35.5 degrees vs 34.5 degrees? Will the 35.5 diamond be a dud and the 34.5 really sparkle that much more?
 

JulieN

Super_Ideal_Rock
Premium
Joined
Jul 25, 2005
Messages
13,324
Date: 3/2/2009 9:28:42 PM
Author: phildominator


On the HCA, this stone gets a 3.9. Just changing the crown angle from 35.5 to 35, HCA score is 2.4.

Change the crown angle to 34.5 and HCA is 1.9.


HCA significantly penalizes this stone for a 1.0 degree difference in Crown Angle.


Question #1 - How precise are these '35.5' measurements? Could the tolerance vary 0.5 degrees?


Question #2 - The HCA score significantly differs with the 1.0 degree change...Does this accurately reflect actual performance difference in a diamond 35.5 degrees vs 34.5 degrees? Will the 35.5 diamond be a dud and the 34.5 really sparkle that much more?
1. PRECISION vs ACCURACY. 35.5 is the average on the stone. SARIN is very accurate. (But the machine can only be as good as its calibration.) You don't need to be more precise than one-tenth of a degree. The range of ACCURACY for SARIN is
2. According to Garry, seems like people should be able to pick out a stone with HCA3, especially when dirty. One whole degree is quite a lot in terms of diamond cutting.
 

Lorelei

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
42,064
Phil, Idealscope or ASET will reveal any negatives with the WF diamond, so see if you can get one. I prefer the second.
 

stonesour

Rough_Rock
Joined
Feb 25, 2009
Messages
5
I have ruled out the WF diamond, and now would like to discuss the two from the local merchant.

The 1.01 falls within the TIC range for the HCA

The 1.15 falls within the FIC range for the HCA, This stone is a H&A which from looking at the virtual scopes it appears are more visable with the FIC Range


From what little I know they both seem to be excellent diamonds. Are the prices for each stone good prices? $5200 for 1.01, $5500 for 1.15.

My future wife would like a bit of a larger diamond, so therefore I am leaning toward the 1.15, I just want to make sure that I am not reading this research wrong.

Thanks for the advice and help!
 

Lorelei

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
42,064
Date: 3/3/2009 9:27:40 AM
Author: stonesour
I have ruled out the WF diamond, and now would like to discuss the two from the local merchant.

The 1.01 falls within the TIC range for the HCA

The 1.15 falls within the FIC range for the HCA, This stone is a H&A which from looking at the virtual scopes it appears are more visable with the FIC Range


From what little I know they both seem to be excellent diamonds. Are the prices for each stone good prices? $5200 for 1.01, $5500 for 1.15.

My future wife would like a bit of a larger diamond, so therefore I am leaning toward the 1.15, I just want to make sure that I am not reading this research wrong.

Thanks for the advice and help!
The HCA is used for elimination rather than selection, however it is useful to tell you which type of category the diamond falls within.

Personally I think the 1.01 is a better balance being TIC and the subsequent proportions. The FIC, it is very difficult to advise without images but if you have seen it in person, like it and your lady would prefer a larger diamond, then that might be the frontrunner. I would recommend checking it out away from the jewellery store lighting if possible so you can give it a good test drive in the everyday lighting the ring will be worn in. With the FIC being EGL graded, I would also make the sale final on it checking out with an independant appraisal to your satisfaction in all areas, and get this in writing.

Pricing, you can check using the Pricescope your Diamond: tool above, the prices given are for online stock, typically brick and mortar stores are more expensive, but it will give you an idea.
 
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