http://monsoonwok.com/grade-faceted/
Grade Faceted
Is thin to extremely thick girdle on diamond an issue?
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
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-education-girdle.html
http://diamonds.pricescope.com/fisheye.asp
http://diamonds.pricescope.com/tablesize.asp
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/Depth_and_table_Chart.asp
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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Diamond Color: Shoppers Buying Guide
Diamonds can be found in every color of the rainbow from clear, colorless (white) to black as coal. Some colors like blue, red, and green are extremely rare and very valuable. Brown is the most common color of diamond with about 80% of diamonds used for industrial purposes like Drill Bits and saw blades. For most diamond shoppers, their goal is to find a diamond as white (colorless) as their budget will allow.
Most diamonds suitable for gem use have trace elements of nitrogen that causes some level of yellow tint. The diamond industry uses a color grading system developed by the Gemological Institute of America (GIA) that ranges from D (completely colorless) to Z (fancy yellow color). Each letter grade corresponds to a small range of color and the color grade of a diamond is determined by comparing it to a set of master stones whose color grade has been determined by a grading laboratory like the GIA.
The top three color-grades D, E and F are considered Colorless. Color-grades G, H, I, and J are known as the Near Colorless and color grades K, L and M are labeled Faint Yellow. It is important to have the color grade designated by one of the top diamond grading laboratories such as the GIA (Gemological Institute of America) or AGS (American Gem Society). Color grades on other documentation can be exaggerated and not accurate relative to industry standards.
The bigger the diamond, the more obvious its color will be, just as a carafe of wine shows more color than a glassful. Some shapes of diamonds show more color than others do. Shapes like the princess cut are relatively bottom heavy and have more diamond material to look through. Individuals see shades of yellow differently and some shoppers prefer the warm look of the Near Colorless range rather than the cold, whiteness of the Colorless grades.
Another factor that influences diamond color is fluorescence. About a fourth of diamonds have a characteristic that when exposed to ultraviolet light, they glow a color, usually blue. The fluorescence is no longer visible once the light source is removed. The intensity of the fluorescence can vary from Faint, which is barely visible to Very Strong, which is easily visible in a brightly lighted room. A little blue fluorescence can sometimes make Near Colorless diamonds appear even whiter than their true color. Some very strong fluorescent diamonds appear milky or oily in appearance and thus not as clear. The presence of fluorescence in a diamond generally reduces its value with higher levels of fluorescence reducing the value the greatest.
There are some processes, like High Pressure/High Temperature (HPHT) or irradiation, which can alter the color of a diamond. With certain types of brown diamonds, the HPHT process can produce Colorless or Near Colorless color. With HPHT, other types of brown diamonds can be converted to fancy colors like yellowish-green, greenish-yellow, and even shades of pink or blue. Irradiation can result in a variety of fancy colors, even though they are often visibly different shades than natural colored diamonds.
Yellow is the most common and affordable of the colored gem diamonds. There are four color-grades of yellow diamonds with enough saturation to be rated Fancy Yellow; Fancy Light Yellow, Fancy Yellow, Fancy Intense Yellow and Fancy Vivid Yellow. Each deeper shade brings a higher price.
What do these color grades, fluorescence, and color treatments mean to the diamond shopper? There are many color grades between the top D color and J, which is the bottom of the Near Colorless range, with the price of a D being about double that of J color. Most of the difference in price is at the lower color grades where there is also the most visible difference to the eye. The price increase from a J to I can be about 20% while from an E to D is closer to 2%. Diamond shoppers need to examine diamonds with their own eyes so they can determine what color they will be happy with relative to the price.
Most shoppers find that for well cut round diamonds, I color provides a nice, white color and a good value. Fancy shaped diamonds tend not to be as brightly faceted as the round brilliant cut so H color is an excellent choice for value and beauty. However, some shoppers will prefer and can afford higher colors and other shoppers will choose lower colors based on what they find appealing to their eye and their budget.
Avoid diamonds with high levels of fluorescence or any kind of color enhancement unless you specifically want that, have been properly advised, and are paying the lower corresponding price. Beware of jewelry stores who stock larger number of diamonds with fluorescence or will not show you the GIA grading report before you purchase. A merchant who is hiding these factors from you is certainly not someone you want to trust with your important diamond purchase.
About the Author
Denny Reinke is the Vice-President of Diamond Source of Virginia, an online diamond retailer specializing in loose diamonds, diamond rings and diamond jewelry located in Richmond, Virginia and on the web at www.DiamondSourceVA.com You can also visit Denny’s blog at www.diamonds.blogs.com
