Rashmi Jameela. Diamonds. May 26th , 2017.
The oval or elliptical cut, is a relatively new shape, invented in the early 1960s by Lazare Kaplan. It provided a change from the classic round cut and hence became very popular. The angles used in oval cut are ideal for the maximum optical effect. The oval shape is also best for maximum scintillation and fire. It has triangular facets and looks even better with a brilliant cut. Before buying an oval diamond, you need to take some precautions. Check it carefully at different angles in natural sunlight. The right width is 1.5:1. If the width is more than this, it may have an undesirable effect, popularly known as the 'bow tie effect'. If the 'bow tie effect' is present, you can see some unwanted dark shades at a few angles of the diamond. If the width is less than 1.5:1, then there are chances that your oval-shape may look like an ill-cut round.
Diamonds have been one of the most sought after and valuable of gemstone for many years. Back when naturally mined diamonds were the only option, they were considered a great luxury and were sold for thousands of dollars. As of today, natural diamonds have some very real competition in lab created diamonds. But how exactly are diamonds created?
After the cut, it is the color that determines the quality and price of this precious gemstone. It is needless to say that a colorless or white diamond, which is the rarest, is the most expensive variety. These gems are graded alphabetically from D (colorless) to X (colored). Color grading is done by placing them face down on a white background and comparing their color to a set of master stones graded by the Gemological Institute of America.
Now it is clear that it is carbon that is the main raw material for formation of diamonds. Apart from the inorganic carbon found in the Earth's crust, one of the sources of organic carbon could be coal. This may happen in case of subduction, wherein carbon from the Earth's crust travel to the mantle. Even in case of diamonds formed in the impact sites, coal could be a source of carbon. So you cannot rule out the possibility of the role of coal in formation of diamonds. However, there are various theories that negate this belief. Here are some of them.
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