Diamonds. Saturday , February 18th , 2017 - 06:00:11 AM
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.
According to this system, the diamond cut grade depends on its design, face-up appearance, and also the craftsmanship that has gone into it. The fire and brilliance of the diamond is evaluated by considering all these factors together. Based on these parameters, the GIA grade system rates diamonds as "Excellent", "Very Good","Good" "Fair", and "Poor". GIA's diamond cut grading system uses 70,000 individual observations, 38.5 million proportion sets and a computer based predictive model to perform the cut assessment. The system came into effect in January 2006 and most of the diamonds graded before will not be entitled to the laboratory-assigned cut grade.
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