Diamonds. Friday , June 23rd , 2017 - 09:00:14 AM
So these are some of the theories that rubbish the claim that diamonds are formed from coal. However, there are chances that diamonds form from coal, in case of subduction. Conversion of coal to diamonds is a natural process that takes millions of years. Even though there are carbon atoms in coal, the amount of impurities are so high, that it takes millions and millions of years for the coal to transform to its nearly purest form - graphite. The conversion of graphite to diamonds takes some more millions of years. Presence of coal in impact sites may also result in formation of diamonds. Even if you want to make diamonds from coal through artificial methods, the resultant diamond will be of very poor quality, due to the high level of impurities.
You can check out the various sizes and shapes before finalizing a piece to grace your ears. Also check the setting styles, meaning the way these diamonds are fixed. Those fixed in white gold are a fave of most of the women. The single studded, small-sized pieces look awesome on men. Women can go for those black studs having a border design of small white diamonds. Also, those in larger sizes and in unique shapes are commonly picked by women. Simple and single stud earrings are quite popular due to their versatility. The varieties also vary according to the diamond cuts. You can go for the asscher or princess cut diamond earrings or checkout other styles as well.
GIA does not provide an "Ideal" cut grade rating, and an AGS "Ideal" cut grade is considered equivalent to the "Excellent" diamond cut grade of GIA. Also, GIA provides a symmetry demerit or "non-standard brillianteering" as it is referred to by GIA sometimes, to help manufactures to improve the standardized Tolkowsky cuts. AGS uses a more accurate combination of the proportional facet ratios to determine the quantity of light return in the diamond. It also takes into account the ray tracing metrics for this purpose. In case of GIA, however, the cut grading system is based on averages which are rounded off to determine the light return phenomenon.
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