Diamonds And Precious Gems

Carbon on its own cannot form into diamonds even deep below the surface of the Earth. There are a few things that have to happen in just the right way. First of all the subsurface carbon is located about 150 km below the Earth's crust has to be subjected to immense heat and pressure. Coal and diamonds are both composed primarily of carbon. Their chemical structures have marked differences. Coal is formed from highly impure carbon. This carbon generally contains  the following elements: oxygen, selenium, hydrogen, nitrogen and sulfur. Diamonds on the other hand require an absolutely pure source of carbon. If there is any defect in purity the diamond will generally change color or become too included to be worked by diamond jewelers. When carbon sources which are very pure such as carbon dioxide are trapped deep under the Earth’s surface, conditions are ideal for the formation of diamonds. 725,000 PSI is about the level of pressure needed to compress the carbon into a diamond

The emerald cut diamond is an oblong cut diamond with truncated corners. Emerald cut diamonds are also referred to as "Cut-Cornered Rectangular Modified Brilliant." It is an ideal shape for showing off the warmer tones of a stone. There are other shapes which are better suited for displaying elements such as sparkle, fire, and brilliance. The shape of emerald cut diamonds show off both the color and the clarity of a diamond. It is a little harder to to avoid seeing the inclusions in an emerald cut diamond so the higher clarity grades are more highly sought after when an emerald cut is purchased. Ring settings which feature emerald cut diamonds as the main stone often include side stones. This is found to greatly enhance the center diamond. An interesting feature of emerald cut diamonds is that they look bigger for their carat weight than a great deal of other types of cuts. People who want a big rock, and would rather have less sparkle than a traditional round cut bril