diamond grading

diamond grading

What Determines the Value of a Diamond?
Diamonds are commonly judged by the four Cs: carat, clarity, color, and cut.

Carat
The carat weight measures the mass of a diamond. One carat is defined as exactly 200 milligrams (about 0.007 ounce). The point unit — equal to one one-hundredth of a carat (0.01 carat, or 2 mg) — is commonly used for diamonds of less than one carat. All else being equal, the value of a diamond increases exponentially in relation to carat weight, since larger diamonds are both rarer and more desirable for use as gemstones.

Clarity
Clarity is a measure of internal defects of a diamond called inclusions. Inclusions may be crystals of a foreign material or another diamond crystal, or structural imperfections such as tiny cracks that can appear whitish or cloudy. The number, size, color, relative location, orientation, and visibility of inclusions can all affect the relative clarity of a diamond.

Color
Diamonds occur in a variety of transparent hues — colorless, white, steel, blue, yellow, orange, red, green, pink, brown — or colored black. Diamonds with a detectable hue to them are known as colored diamonds. Colored diamonds contain impurities or structural defects that cause the coloration, while pure or nearly pure diamonds are transparent and colorless.

Cut
The most important aspect about how bright a diamond is going to be, is how well it is cut. We don't mean its shape but instead how exacting, to perfect proportions the stone is cut. If a diamond is not cut to extremely precise specifications it will "leak" light out the bottom. It will also let too much light in from the bottom so that you see what is under the stone. In almost all cases this "Windowing" is very undesirable, and does not show up in a well cut diamond

Learn More About diamond grading

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Diamond Color Grading Charts
Diamond Color Grading Chart: How all the systems at other diamond laboratories compare with the GIA color grading system.
http://www.diamondhelpers.com/ask/0023-colorscales.shtml

Ben Bridge Jeweler - For Information about diamond grading chart,...
Bringing you the best in information about diamond grading chart.
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Amazon.com Jewelry Store Launches New Custom Diamond Ring Creator;
Diamonds arrive in an elegant finished-wood jewelry box accompanied by a diamond grading report and information about how to care for the...
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Diamond Grading
Diamond Grading.com. A website by GemLab Graders featuring a Diamond Tutorial.
http://www.diamondgrading.com/

:: European Gemological Laboratory ::
European Gemological Laboratory is an international inderpendent leader in diamond grading and training for all diamond business solutions.
http://www.egl.co.za/

Wholesale Canadian Diamonds, Engagement Rings, GIA and AGS ideal cut...
Diamond brokers offer wholesale Canadian diamonds and platinum jewelry.
http://www.canadadiamonds.com/

Diamond High Council
Supply a wide variety of publications with information related to the diamond trade and industry in several languages.
http://www.diamonds.be/

E Wholesale Loose Diamonds, Loose Diamonds, Diamond Rings, Diamond...
Find information on wholesale loose diamonds, loose diamonds, and diamond jewelry. Learn about diamond grading, fancy diamonds, black diamonds, and...
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Diamond prices comparison, loose diamonds pricing trends
> Pear Shape > Heart Shape > Oval > Asscher > Trillion / Triangle Diamond Grading > Cut > Color > Clarity > Carat Weight > Table Width > Total Depth...
http://www.diamondse.info/

INTERNATIONAL GEMOLOGICAL INSTITUTE
Laboratoire d'expertise attestant de l'authenticité et de la qualité des pierres précieuses et bijoux, délivrance de certificats et rapports. Cours...
http://www.igiworldwide.com/

Diamond Grading Laboratory- AGS Laboratories Home Page
Provides diamond grading services featuring grading of the diamond cut.
http://www.agslab.com/

Index
Gem Testing Laboratory. Gem identification and diamond grading services. Gem-A USA ... Find out more about our USA branch.
http://www.gagtl.ac.uk/

Gem Appraisers
Diamond grading and other appraisals for the trade and general public. AGA diamond cut grading charts for round and fancy shaped diamonds.
http://www.gemappraisers.com/

Engagement Rings
Diamond Grading Natural gemstone?, Ideal Princess Cut Diamond, Wedding Flowers, Celebrity Rings, Tracing a Diamond's History, My Proposal...
http://engagementrings.smartowl.info/