Pax Ivanna. Diamonds. August 08th , 2017.
First of all, the dispelling of a romantic notion. Diamonds aren't formed from coal. Most of them are forged from carbon that's trapped inside the Earth's mantle, at the very beginning of our planet's formation (about 3 to 4 billion years ago), at a depth of more than a 100 kilometers, below the Earth's surface. Whereas coal is a sedimentary rock, formed from organic plant matter, some millions of years ago, which is usually buried about 2 miles below the planetary surface.
While buying diamonds, most people base their decision on size and sparkle. However, similar stones with a large disparity in price leave us flummoxed. To understand this, we need to look at the grades. The value of this gemstone is estimated according to the four Cs: clarity, color, carat, and cut. Richard T. Liddicoat of the GIA (Gemological Institute of America) proposed and developed the GIA Clarity Grading System in 1952. Over time, several changes have been incorporated into the system. Most of them are graded according to the GIA chart, which considers minute differences while categorizing these stones. Among the different qualities the chart is graded on, clarity, color, and cut are qualitative values, whereas carat, which is the weight of the diamond, is a quantitative value.
Cubic zirconia (CZ) is a synthetic cubic crystalline form of zirconium dioxide (ZrO2), fashioned as a diamond simulant (non-diamond material). At times, even trained gemologists, can be fooled by its imitations. However, the difference between CZ and diamond can be revealed through a careful gemological inspection, using equipment such as a microscope or loupe which is a small magnifying glass, used by jewelers and horologists. CZ holds certain properties that are very close to a diamond. That's the reason it was developed by the Russians to be used in the optics of their lasers. However, the two differ widely on many parameters. Let us see the differences between the two.
AGS's grading system considers 11 combinations of three parameters namely proportion, light performance, and finishing properties to evaluate the fire and brilliance of the diamond under consideration. Based on these evaluations, the grade ratings of "Ideal", "Excellent", "Very Good", "Good", "Fair" and "Poor" are assigned. A diamond that meets AGS's perfect standards of symmetry, polish and proportion for cut grade is termed as "Ideal", and it is also popularly known as a "Triple-Zero" grade.
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