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.5 carat diamond

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maggie4

maggie4

Rough_Rock
Joined
May 20, 2009
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I am not a diamond expert. Please let me know your thoughts reagrding this .47 carat round diamond. It is being used as a center stone an an anniversary ring. Thanks!!

GIA Report
Clarity-IF
Color-H
Measurements: 61.8%/56%- 5.02-5.04x3.11
Cut Grade Excellent
Polish-Excellent
Symmetry-Excellent
 
Can you post the crown and pavillion angles off the GIA report, please?

Or if you post the GIA report #, we can look it up from that.
 
Ditto. Need more data.
 
Date: 5/22/2009 10:20:54 AM
Author:maggie4
I am not a diamond expert. Please let me know your thoughts reagrding this .47 carat round diamond. It is being used as a center stone an an anniversary ring. Thanks!!

GIA Report
Clarity-IF
Color-H
Measurements: 61.8%/56%- 5.02-5.04x3.11
Cut Grade Excellent
Polish-Excellent
Symmetry-Excellent
Click to expand...
Hi Maggie,

I just wanted to check if IF clarity is your preference? I just wanted to mention you could lower this without visual sacrifice and maybe get a slightly larger diamond if you preferred - but if IF is indeed your preference then don''t worry!
 
Depth %: 61.8%

Table %: 56%

Symmetry: Excellent

Polish: Excellent

Girdle: Thin to medium

Culet: None

Fluorescence: None

Measurements: 5.04 x 5.02 x 3.11 mm
 
Date: 5/22/2009 11:42:53 AM
Author: maggie4
Depth %: 61.8%

Table %: 56%

Symmetry: Excellent

Polish: Excellent

Girdle: Thin to medium

Culet: None

Fluorescence: None

Measurements: 5.04 x 5.02 x 3.11 mm
Click to expand...
Thanks, do you have the crown and pavilion angles please? These should be on the report if it is since early 2006, the angles are critical info in order to be able to evaluate this diamond.

Alternatively do you have the GIA report number? Then we could look it up from there.
 
GIA# 6102024760
 
Depth: 61.8%
Table: 56%
Crown Angle: 34.5°
Crown Height: 15.0%
Pavilion Angle: 41.2°
Pavilion Depth: 43.5%
Star length: 55%
Lower Half: 75%
Girdle: Thin to Medium, Faceted (3.5%)
Culet: None
 
Slightly steep in the pavilion angle for that crown angle. I would probably not consider it unless you have access to an IdealScope image?
 
What would be a better pavillion angle?
 
Date: 5/22/2009 11:57:46 AM
Author: maggie4
What would be a better pavillion angle?
Click to expand...
Lorelei has a "Cliff''s Notes" of angles that she posts that is very helpful. I''m sure she will come back and have that for you.

In the meantime, pavilion angle of 40.6-41 and crown angle of 34-35 is a good start.
 
Actually the pavilion angle is on the steep side here, the crown angle is fine - it would be better if the pavilion angle was shallower. An Idealscope image is definitely needed in order to judge how this angle combo works, it is possible there will be light leakage which we don''t want.

Here are the '' cliff''s notes'' for suitable angle combos that Jet suggested which should help you. ( quoted 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).

 
How about this diamond instaed?
Round Brilliant
Measurements: 5.41 - 5.44 x 3.35 mm

Carat Weight: 0.59 carat
Color Grade: H
Clarity Grade: VS1
Cut Grade: Excellent
Proportions:
Depth: 61.8%
Table: 57%
Crown Angle: 36.0°
Crown Height: 16.0%
Pavilion Angle: 40.6°
Pavilion Depth: 43.0%
Star length: 50%
Lower Half: 80%
Girdle: Thin, Faceted (3.0%)
Culet: None

 
Numbers looks good.
 
This one has better possibilities than the first, but I would still want to see a IS due to the crown angle.
 
Date: 5/22/2009 12:23:14 PM
Author: Stone-cold11
Numbers looks good.
Click to expand...
Yes indeed, this diamond also falls within fiery ideal cut range ( FIC) which basically means the diamond might show some extra fire or coloured light if the lighting conditions are right.

Can you get an Idealscope or ASET image please?
 
Thank you for all of your feedback, one more:

Measurements: 5.11 - 5.12 x 3.12 mm

Carat Weight: 0.50 carat
Color Grade: H
Clarity Grade: VVS1
Cut Grade: Excellent
Proportions:
Depth: 61.0%
Table: 60%
Crown Angle: 33.5°
Crown Height: 13.5%
Pavilion Angle: 41.4°
Pavilion Depth: 44.0%
Star length: 55%
Lower Half: 75%
Girdle: Medium to Slightly Thick (4.0%)
Culet: None
Finish:
Polish: Excellent
Symmetry: Excellent
Fluorescence: None
Clarity Characteristics:
Surface Graining, Feather
 
Steep pavilion. Definitely no.
 
Based on your advise, I think I may have found a better one see below:

Round Brilliant
Measurements: 5.19 - 5.22 x 3.17 mm

Carat Weight: 0.51 carat
Color Grade: H
Clarity Grade: VS1
Cut Grade: Excellent
Proportions:
Depth: 60.9%
Table: 56%
Crown Angle: 34.5°
Crown Height: 15.0%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 55%
Lower Half: 75%
Girdle: Thin to Medium, Faceted (2.5%)
Culet: None
Finish:
Polish: Excellent
Symmetry: Excellent
Fluorescence: None
Clarity Characteristics:
Pinpoint, Crystal
 
This looks good from the numbers, but I will prefer see an IS image of that if I am to buy that.
 
does bluenile have Idealscope or ASET images?
 
Date: 5/22/2009 1:21:33 PM
Author: maggie4

Thank you for all of your feedback, one more:

Measurements: 5.11 - 5.12 x 3.12 mm

Carat Weight: 0.50 carat
Color Grade: H
Clarity Grade: VVS1
Cut Grade: Excellent

Proportions:
Depth: 61.0%
Table: 60%
Crown Angle: 33.5°
Crown Height: 13.5%
Pavilion Angle: 41.4°
Pavilion Depth: 44.0%
Star length: 55%
Lower Half: 75%
Girdle: Medium to Slightly Thick (4.0%)
Culet: None

Finish:
Polish: Excellent
Symmetry: Excellent
Fluorescence: None

Clarity Characteristics:
Surface Graining, Feather
Click to expand...
Definite no to this one due to the pavilion angle.
 
Date: 5/22/2009 1:34:20 PM
Author: maggie4

Based on your advise, I think I may have found a better one see below:

Round Brilliant
Measurements: 5.19 - 5.22 x 3.17 mm

Carat Weight: 0.51 carat
Color Grade: H
Clarity Grade: VS1
Cut Grade: Excellent

Proportions:
Depth: 60.9%
Table: 56%
Crown Angle: 34.5°
Crown Height: 15.0%
Pavilion Angle: 41.0°
Pavilion Depth: 43.5%
Star length: 55%
Lower Half: 75%
Girdle: Thin to Medium, Faceted (2.5%)
Culet: None

Finish:
Polish: Excellent
Symmetry: Excellent
Fluorescence: None

Clarity Characteristics:
Pinpoint, Crystal
Click to expand...
An Idealscope image would be needed for this one but BN don''t supply them as you are aware.
 
Date: 5/22/2009 4:11:39 PM
Author: maggie4
How about this one? (see the link):

http://www.jamesallen.com/diamonds/H-VVS2-Ideal-Cut-Round-Diamond-1239509.asp
Click to expand...
It might be fine but the report with the details we need hasn't been uploaded yet, also you would need to check the very thin part of the girdle wasn't a potential durability issue by asking James Allen's gemologist to check it out if when you get the report if the diamond is worth further investigation.
 
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