Is thin to extremely thick girdle on diamond an issue?

Question

Hi, I am very interested in purchasing this diamond as i saw it in person, and liked the measurements on it. It makes it look alot bigger than an average 2.0 cushion.

My concern is the girdle, table details. Do you thin to extremely thick will be a problem for this stone? Would you not recommend getting this diamond because of this? I am getting a pretty good price on it (10k) and would like an opinion. Overall, the stone looked good when i placed it in a vintage style setting it...but i am just an amateur.

Shape: Cushion
Carat Weight: 2.01
Color: F
Clarity: SI2
Graded By: GIA
Cut Grade: Very Good

Depth: 57.5%
Table: 70%
Girdle: Thin to Extremely Thick, Faceted
Culet: None
Polish: Very Good
Symmetry: Good
Fluorescence: None
Measurements: 8.35 x 7.31 x 4.20
Length / Width Ratio: 1.14

Answer 1

Best Answer - Chosen by Asker

Yeah it is. Like I said before, the girdle is the thickness of the part of the diamond right under the table (which is what you see face up). And .6mm is the thickness of a girdle rated thin, 3.0mm is a thickness of a diamond rated thick.

What a thin girdle does is crack, and chip, increasing the chances of losing the stone if the prongs bend (and they do). This is more of a risk on a diamond that has corners. And no way is a very thin girdle ever a good idea.

An extremely thick girdle is rated after very thick and is the thickest you can be rated.

What a very or extremely thick girdle it uglies up the stone. The refraction, and light gets muddled. A decrease in brilliance and scintillation. A shallow depth allows light to escape out the bottom increasing the chances of a fish eye effect.

http://www.sunjewelry.com/diamond-educat…
http://diamonds.pricescope.com/fisheye.a…

http://diamonds.pricescope.com/tablesize…
beware of large table size and fish eye effect (more of a risk when table is large and depth is deep)
a large table gives a glassy appearance with less scintillation and brilliance

http://diamonds.pricescope.com/fnc3.asp
you can see this grading chart of fancy cut diamonds (notice its not specific for a cushion, though parameters for cushions generally follow these except l/w ratio which it seems you already know is 1.10-1.20) grades a below average 4a-4b class for an extremely thick girdle, and the table falls into 3b US domestic average depth also falls into the same range of US domestic average
http://www.large-diamonds.com/Education/…
basically if you have a large table you want a shallow depth

10k is a good price for this. Suggest asking on pricescope.com diamond forum to get a lot of educated opinions on it. There are lots of jewelers and gemologists that frequent the forum

I am a fan of a large table/shallow depth and do have a diamond like this t-68, d-59

Before buying this, suggest viewing again and looking closely at the girdle. Since you viewed it, the clarity was acceptable to you with no offensive inclusions. the table/depth on fancies is more of a guideline and preference. For the price I can overlook those things, but before purchase I'd want to scrutinize that girdle, inspect it again and ask q. Now with that variation in size difference, it should be pretty clear where the diamond is thin and where its extremely thick. I'd go in there with a ruler and be measuring the girdle with a small metal ruler in mm. They will have one there at the store if you don't have one. Be sure to view the diamond with a loupe from the pavillion, and in natural light, go to a spot of the store that is dark and shield the u/v light.

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Asker's Comment:

Thank you for your suggestions

Answer 2

well i have to saay that if the diamond its of 2.0 cushion then u'll have to go with a medium-thick facete so it wont look so out there and some people might think that the diamond its fake so i guess this its why u go with the med-thick facete
hope this helps.

Answer 3

I'm not going to pretend that I know about girdle, but I was curious myself so I looked it up and found this....

Ideal girdle thickness should range between Very Thin to Thick. Sometimes a diamond can have a perfect medium girdle around ninety-nine percent of its diameter and is only very thick at one very minute isolated point. This diamond will receive a GIA girdle grade as medium to very thick. In this case, choosing a diamond with a very thick girdle could be acceptable because only one minute part of the girdle reached very thick and it will unlikely affect the diamonds appearance. This judgment can only be made by visual inspection by a trained Certified-Gemologist-Appraiser. Diamonds that have grades extremely thin, very thick, or extremely thick are usually not recommended.

If you have seen it and it looks good though, I would go for it myself. Again, I don't know the first thing about girdle.....I tried to help though! lol

Good luck!