General rule to follow for Depth, Table, and Girdle?

[ne00]

Just starting my research for loose diamonds and still can''t grasp the concepts for Depth, Table, and Girdle. Take for example, I saw the two following on a website, only difference seems to be with these three. One cut is Premium and the other is excellent and one is 1.03 while other is 1.01, prices are exactly the same.

I''ve seen a lot of these price variances for cushion and radiant shapes as well, some with better Color or Clarity grades will be cheaper than ones with lower Color and Clarity grades both are same Carat, only difference I''ve seen are related to Dept, Table, and Girdle.

Shape: Princess
Carat weight: 1.03
Cut: Ideal
Color: G
Clarity: SI1
Certificate: GIA

Depth: 73.9%
Table: 71.0%
Polish: Excellent
Symmetry: Very Good
Girdle: Slightly thick to thick
Culet: None
Fluorescence: None
Measurements: 5.41*5.40*3.99
Ratio: 1.00

===

Shape: Princess
Carat weight: 1.01
Cut: Premium
Color: G
Clarity: SI1
Certificate: GIA

Depth: 74.0%
Table: 76.0%
Polish: Excellent
Symmetry: Very Good
Girdle: Thick to very thick
Culet: None
Fluorescence: None
Measurements: 5.44*5.43*4.02
Ratio: 1.00

Thanks

Dave

 

[Resonance.Of.Life]

For Princess cuts, it''s not the same as for rounds where there are general parameters to fall within.

Do any of these vendors offer an ASET to assess light return and leakage? Also, go on the pricescope diamond search to see if these diamonds are in the right ballpark

I''m sure other PSers will chime in with more helpful information.

 

[jet2ks]

Cut is king!!! In other words, two diamonds can have be the same on three of the C's (carat, color and clarity) but the cut will determine the overall quality and appearance and therefore, price. A well cut diamond will be bright and sparkly, while a poorly cut one will look like frozen spit--dull and dark, no matter how good the color and clarity are. The measurements you mentioned are a part of what factors into the cut grade, so, yes, variation in them will affect the price. Don't be misled by what terms a vendor uses for the cut grade, they can use any terms they like and things like ideal and excellent are thrown around way too much. AGS is the only lab that issues a cut grade for princess at the present time.

ROL is on the right track that princess and other fancy shapes cannot really be judged on numbers alone. High quality photos and reflector images (ASET and/or Idealscope) are needed to judge performance if the diamond cannot be viewed in person by experienced eyes.

AGA has a grade chart for princess that is useful for eliminating stones. Here is a link http://diamonds.pricescope.com/fnc1.asp

If you stay in the 1A and 1B parameters, it will increase your odds of finding a well cut stone. Once you have narrowed the choices down using that chart, then the pictures and images come into play.

Of the two you posted, the biggest thing I see is that the second has a table % larger than depth (the reverse is preferred) and the girdle on both diamonds could be hiding extra weight with the very thick on the second one being the worse offender. (staying in the thin-slightly thick range is most desirable, though med-thick can be OK in a princess. Avoid very thin or extremely thin as the girdle will be prone to chipping) The first one is probably worth pursuing further.

 

[Lorelei]

Great post Jetskis!