There is a short answer. A long fascinating story to this question.
Short answer:
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GIA not only invented the wheel (the 4Cs), but they also created all the tools for making the wheel parts and standardized the wheel making process.
The Fascinating Story: Relentless Pursuit for Accuracy and Consistency
Primordial Chaos:
Out of the 4Cs (carat weight, color, clarity, and cut), only carat weight was the standard and everything else had multiple sets of loosely defined descriptions. And others referred to color as “finest white” and “fine white”. Clarity was labeled as “without flaws” or “with imperfections.
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The Defining Moment:
To standardize the industry and help consumers to make better-informed purchases, one pioneer took it upon himself to revolutionize the entire system. Shipley. Liddicoat. Mr. (*Mr. Look him up, you will be surprised. Viewed against a set of master stones. For color, the diamond should be graded under a specific light source against a neutral background. To ensure consistency and precision of the grading results, the new system laid out strict requirements for grading. A bad day should not mean a poorer color grade. The diamond should be held table-side down. Since our color perception is highly dependent on the environment and our physical state, the grading environment is highly controlled to eliminate these influences.
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For clarity, the diamond is viewed with both a 10x loupe and a high-powered microscope. The various inclusions are then plotted on a diagram. Lastly, the diamond is viewed again with a 10x loupe for a final review. The clarity grade is then assigned based on the number, size, relief (contrast with the background), nature (what type of inclusion), and position of the various inclusions.
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The Road to Perfect Precision:
No. All the angles and facets are recorded by an optical laser with, you guessed it, laser precision. Are robots taking our jobs? Maybe. Then the diamond color is evaluated. Yeah, the road to perfect consistency and accuracy is that intense. A gemologist double-checks the result for accuracy against the master stones to verify. That many diamonds, especially very small, could take me days to sort through. If they disagree, the stone is given to a third gemologist for a final decision and settle that diamond debate. If they agree on the grade, the diamond receives that grade. One of the more impressive machines can sort melee diamonds (0.005 to 0.25 ct.
Summary:
GIA diamond reports really stand alone as the best, oldest, most uncompromising, and technologically advanced reports out there.
When it comes to purchasing gemstones people are more often interested in color than any other aspect of that crystal. Fact is that people are often not familiar with all the healing properties. Believed it or not, pink crystals are very common choice when it comes to purcahsing colored gemstones. Benefits that are connected with particular gemstones. Because of that, girls tend to go for color that they like.
