do these numbers work?

[dcguy01]

Hi Garry and other experts,

can you comment on what you guys think about this diamond?

Shape Round
Cut Brilliant
Measurements 6.72 - 6.75 x 4.20 mm
Carat Weight 1.18
Color Grade G
Fluorescence None
Precision of Cut Excellent
Symmetry Excellent
Polish Excellent
Clarity Grade VS2
Total Depth % 62.4
Table Size % 56
Crown Angle 35.1
Pavilion Angle 40.8
Lower Half Length % 80
Girdle Thickness Medium to slightly Thick
Culet None


thanks,
dcguy

 

[stone-cold11]

Promising. Idealscope image?

 

[Dreamer_D]

Date: 6/19/2010 12:06:21 PM
Author: Stone-cold11
Promising. Idealscope image?

Ditto.

 

[Garry H (Cut Nut)]

yes, promising

 

[dcguy01]

Hi Garry and All,

Thanks for the feedback. I ended up going with this ring and my wife loves it.

we are thinking about upgrading. here is the spec of the new ring.

Shape Round
Cut Brilliant
Measurements 7.44 - 7.50 x 4.56 mm
Carat Weight 1.53
Color Grade H
Fluorescence Medium Blue
Precision of Cut Excellent
Symmetry Very Good
Polish Excellent
Clarity Grade VS1
Total Depth % 61.0
Table Size % 55
Crown Angle 35.0
Pavilion Angle 40.8
Lower Half Length % 75
Girdle Thickness Thin to Medium
Culet None
Star Length % 52%

i think this could be a great ring but the "medium blue" fluorescensce is worrying me. what do you guys think?

thanks in advance!

 

[treasurehunter]

Don't avoid medium florescence with an H colour , look for it. It makes it face up whiter.

However two concerns,

1.'Precision of cut' ? what is this term does it have a GIA cert?
2.VS1 , overpaying for VS1 grade , go for an eye clean SI1 and get a larger stone.

 

[dcguy01]

Don't avoid medium florescence with an H colour , look for it. It makes it face up whiter.

However two concerns,

1.'Precision of cut' ? what is this term does it have a GIA cert?
2.VS1 , overpaying for VS1 grade , go for an eye clean SI1 and get a larger stone.

Thanks Treasurehunter.

I'll be looking at the ring tomorrow. The ring is from Tiffany's and it says

PRESENCE
PRECISION OF CUT Excellent
SYMMETRY Very Good
POLISH Excellent

I asked about a GIA report and I was told they don't have/provide them.

I'm not sure about SI1... actually I was thinking about going with higher Clarity... maybe vvs? My concern is that the inclusion will have an impact on the "performance' of the ring... if that makes sense.

 

[krisjon]

Tiffany does their own grading/reports.
They make beautiful jewelry, but you also pay a serious premium for the name and the blue box, not a better stone.
With a little research/homework, you can blow away Tiffany specs for half the price.

The stone you referenced should be really nice, though.

 

[dcguy01]

Tiffany does their own grading/reports.
They make beautiful jewelry, but you also pay a serious premium for the name and the blue box, not a better stone.
With a little research/homework, you can blow away Tiffany specs for half the price.

Hi Krisjon,

I totally agree with you but my wife doesn't see it that way. She loves the blue box!

just so it's clear, the first ring was from tiffany's so we're looking to upgrade using their upgrade policy.

 

[krisjon]

Ah, gotcha.
There are some things you can't argue with.
Should be a typical Tiffany sparkler.
Those numbers are on the edge, but within AGS 0 ideal proportions, so you're in good shape..

 

[dcguy01]

Ah, gotcha.
There are some things you can't argue with.
Should be a typical Tiffany sparkler.
Those numbers are on the edge, but within AGS 0 ideal proportions, so you're in good shape..

hahaha.. you got that right.

can you tell me what you mean by "those numbers are on the edge"?

 

[krisjon]

Ah, gotcha.
There are some things you can't argue with.
Should be a typical Tiffany sparkler.
Those numbers are on the edge, but within AGS 0 ideal proportions, so you're in good shape..

hahaha.. you got that right.

can you tell me what you mean by "those numbers are on the edge"?

Sure thing. If you plug in your crown/pavillion with appropriate table size chart here:

http://www.agslab.com/docs/pbcg/AGSLProportionCharts.pdf

You'll see the numbers for that stone sort of fall in the upper right/outer edge of AGS 0 ideal proportions.
A portion of a degree more either way can throw it out into EX or even VG.
These are the tightest cut specs for graded diamonds, so if you're anywhere in this pink zone, it's a top cut.
Only about 1% of diamonds make this cut grade, so even without a GIA/AGS report, this stone should be a great performer.
Fortunately, you'll be able to see and verify it with your own eyes.

 

[John P]

Sure thing. If you plug in your crown/pavillion with appropriate table size chart here:

http://www.agslab.com/docs/pbcg/AGSLProportionCharts.pdf

You'll see the numbers for that stone sort of fall in the upper right/outer edge of AGS 0 ideal proportions.
A portion of a degree more either way can throw it out into EX or even VG.
These are the tightest cut specs for graded diamonds, so if you're anywhere in this pink zone, it's a top cut.
Only about 1% of diamonds make this cut grade, so even without a GIA/AGS report, this stone should be a great performer.
Fortunately, you'll be able to see and verify it with your own eyes.

Krisjon, I hope you don't mind a clarification:

The AGSL Proportion Charts you linked correlate to the seldom-used 2D proportions-based DQR (Gold report). The stricter 3D performance-based DQD (Platinum report) for which they are best-known is the only system where AGSL awards a "0" in performance. No grading charts exist for that system since each diamond must undergo ray-tracing to see how all 57 (or 5 facets interact together specifically.

However AGSL does provide cutting guidelines to the trade, and 56 40.8 35.0 is also predicted on the threshold of 0 there.
So the information I'm providing doesn't change your bottom-line conclusion, I simply add it for clarity.

For anyone interested, here's a bit more about this, as well as challenges presented by rounded-reporting formats (not a prob with Tiffany): https://www.pricescope.com/communit...-angles-numbers.196846/#post-3586783#p3586783

 

[krisjon]

Awesome clarification, John. As always, I defer to the elite membership here and am always learning.
There's a big difference between my regurgitating information/being helpful vs. truly knowing the trade/art!

 

[dcguy01]

Sure thing. If you plug in your crown/pavillion with appropriate table size chart here:

http://www.agslab.com/docs/pbcg/AGSLProportionCharts.pdf

You'll see the numbers for that stone sort of fall in the upper right/outer edge of AGS 0 ideal proportions.
A portion of a degree more either way can throw it out into EX or even VG.
These are the tightest cut specs for graded diamonds, so if you're anywhere in this pink zone, it's a top cut.
Only about 1% of diamonds make this cut grade, so even without a GIA/AGS report, this stone should be a great performer.
Fortunately, you'll be able to see and verify it with your own eyes.

Krisjon, I hope you don't mind a clarification:

The AGSL Proportion Charts you linked correlate to the seldom-used 2D proportions-based DQR (Gold report). The stricter 3D performance-based DQD (Platinum report) for which they are best-known is the only system where AGSL awards a "0" in performance. No grading charts exist for that system since each diamond must undergo ray-tracing to see how all 57 (or 5 facets interact together specifically.

However AGSL does provide cutting guidelines to the trade, and 56 40.8 35.0 is also predicted on the threshold of 0 there.
So the information I'm providing doesn't change your bottom-line conclusion, I simply add it for clarity.

For anyone interested, here's a bit more about this, as well as challenges presented by rounded-reporting formats (not a prob with Tiffany): https://www.pricescope.com/communit...-angles-numbers.196846/#post-3586783#p3586783

Hi John,

Thanks for adding more information and the clarification. Much appreciated!

thanks!

 

[dcguy01]

Ah, gotcha.
There are some things you can't argue with.
Should be a typical Tiffany sparkler.
Those numbers are on the edge, but within AGS 0 ideal proportions, so you're in good shape..

hahaha.. you got that right.

can you tell me what you mean by "those numbers are on the edge"?

Sure thing. If you plug in your crown/pavillion with appropriate table size chart here:

http://www.agslab.com/docs/pbcg/AGSLProportionCharts.pdf

You'll see the numbers for that stone sort of fall in the upper right/outer edge of AGS 0 ideal proportions.
A portion of a degree more either way can throw it out into EX or even VG.
These are the tightest cut specs for graded diamonds, so if you're anywhere in this pink zone, it's a top cut.
Only about 1% of diamonds make this cut grade, so even without a GIA/AGS report, this stone should be a great performer.
Fortunately, you'll be able to see and verify it with your own eyes.

Hi Krisjon,

thanks for the link. it's very informative.

I also just noticed that I made a mistake on the diamond spec. it should read 40.7 degrees for the pavilion angle.

 

[krisjon]

Happy to help. You're still in a good spot with 40.7
Your eyes are still the best judge, but that Tiffany stone is in the AGS Ideal wheelhouse.
Many aren't and are still great diamonds, but having one that is within AGS specs is an added bonus. Buy with confidence.

 

[dcguy01]

I had a chance to take a look at the ring today. it looked great! I was very curious about the medium blue fluorescence. To my surprise, i couldn't see any different between this ring and another that that "none" fluorescence.

I was curious about the H color as well and got an F color ring for comparison. I could tell the subtle yellow in the H but to my surprise, i saw a glowing blue diamond on the "F" ring! it really like it and think it's awesome.



Here is the "H" color ring that is also medium blue in fluorescence.



any ideas why they are so different when they have the same medium blue fluorescence? is this normal?