Opinions on this Stone

[Dancing Queen]

Hi guys,

I know the boyfriend is looking at this stone from ERD and being new here, I would love some advice from you fellow ps''ers. Be honest of course!!!

Shape: RB
Carat: 1.72
Color: I
Clarity: SI2
Depth: 63.7
Table: 56
Culet: None
Polish: Very Good
Symmetry: Very Good
Fluorescence: SB

Thoughts?? Any help is truly appreciated!!

 

[Lorelei]

Date: 1/8/2009 8:33:29 AM
Author:Dancing Queen
Hi guys,

I know the boyfriend is looking at this stone from ERD and being new here, I would love some advice from you fellow ps'ers. Be honest of course!!!

Shape: RB
Carat: 1.72
Color: I
Clarity: SI2
Depth: 63.7
Table: 56
Culet: None
Polish: Very Good
Symmetry: Very Good
Fluorescence: SB

Thoughts?? Any help is truly appreciated!!

Hi DQ,

I would personally pass on this one due to the depth, it is likely it will look small for its weight. Do you have the diameter measurement please and girdle thickness? We also need the crown and pavilion angles to make a realistic judgement on this diamond, you would be able to get those from the grading report, GIA I assume? Going on the depth alone I would keep looking personally. Also make sure with SI2 clarities that the diamond is eyeclean to your standards.

 

[Dancing Queen]

See I don''t really understand depth and all that stuff so I''m glad I''m asking. I know he''s working with Gary at ERD so hopefully he''ll get the great advice everyone is raving about. OK so...measurements:

7.51-7.57x4.80
Girdle: STK-THK
Crown Angle: 36.5
Crown Height: 16.0
Pavilion Angle: 40.8
Pavilion Depth: 43.0


Like I said, we are newbies, this is all jibberish right now! Thanks for your help!!

 

[Daisi2112]

Hi there! I might pass on that stone...SI2 inclusions may be visible to the eye. If you decide on that one, make sure there are no eye visible inclusions. Good luck and happy stone shopping!

 

[Lorelei]

Date: 1/8/2009 8:56:22 AM
Author: Dancing Queen

See I don't really understand depth and all that stuff so I'm glad I'm asking. I know he's working with Gary at ERD so hopefully he'll get the great advice everyone is raving about. OK so...measurements:

7.51-7.57x4.80
Girdle: STK-THK
Crown Angle: 36.5
Crown Height: 16.0
Pavilion Angle: 40.8
Pavilion Depth: 43.0


Like I said, we are newbies, this is all jibberish right now! Thanks for your help!!

No worries, we will guide you through!

Ok, as I suspected this diamond is facing up a bit small for its weight. The angle combo could be better, the angles are crucial for diamond performance. Basically you can find a better cut diamond certainly -, it isn't a dreadful cut by any means but you could find a diamond with proportions which are more favourable to enable performance and sparkle, also there is the question of whether this one is eyeclean to your standards or not....The diamond also has strong blue fluorescence which can be a positive in an I colour as it is said to help a diamond face up whiter, just check though if you want this one that it doesn't make the diamond look cloudy in some lights, the vendor will advise you - but negative effects are rare.

If you decide to keep looking, here are some numbers you can use as a guide to help you find a well cut round diamond.

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.

And from expert John Pollard.

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

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).

 

[Dancing Queen]

The SI2 clarity kind of scares me, too.

And WOW, thank you so much for that little lesson, this stuff is actually really interesting!! I think we will most likely pass on this stone...which is fine!

One more question...what do people think of fluroescence?? yay or nay?

DQ

 

[Lorelei]

Date: 1/8/2009 9:11:46 AM
Author: Dancing Queen
The SI2 clarity kind of scares me, too.

And WOW, thank you so much for that little lesson, this stuff is actually really interesting!! I think we will most likely pass on this stone...which is fine!

One more question...what do people think of fluroescence?? yay or nay?

DQ

Glad to help! It IS interesting stuff!

Fluorescence has its fans here ( I am one) so it can be a preference thing. You normally see blue fluoro, however other colours come along occasionally such as yellow. Some believe medium and above blue fluorescence can help a diamond face up a bit whiter, so it can be beneficial in the I and J colours etc. As I said above, very rarely strong blue or very strong can make a diamond look cloudy in some lights, but this is rare - just always check with your vendor in such cases.

Some reading here - http://diamonds.pricescope.com/fluor.asp