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Diamonds News

GIA Gem Laboratory Expert Explains Identification Techniques of Natural and Treated Red, Pink Diamonds at AGA Conference

July 12, 2005 – The allure of color and the beauty of diamonds have a powerful appeal for the gem-buying public, and demand for fancy-colored...

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CUT

Cut

The cut of a diamond refers to the dimensions of a diamond. A diamonds brilliance and beauty is shown when a diamond is cut to the proper dimensions allowing light to travel through and reflect.  This is different from the shape of the diamond. The cut of a diamond can affect the its weight. A diamond cut too deep may be larger in size, but have a smaller carat weight. A diamond cut too shallow maybe small in size, but have a higher carat weight.

When a stone is properly cut, its reflection will allow for the proper reversal of light from the point where the diamond has been cut.  The path of light must be cut by the diamond cutter inconsideration to the proper proportions. 

 →  Deep Cut

If the cut of a diamond is too deep, light is reflected at the wrong angle and is emitted back up.

 

 

 →  Shallow Cut

If the cut of a diamond is too shallow, light passes through the stone without being reflected

 

 

 →  Proportional Cut

Many diamond cutters often do not provide proportional cuts to diamonds because they seek to get the maximum weight from the rough diamond which provides a higher weight and therefore a higher price.  This practice is common in the marketplace today which tends to increase the cost of the diamond even though its not a proportional cut.  Make sure to seek the help of an independent consultant when making your purchase.