There were more than 70,000 observations of 2,300 diamonds in studies conducted across all sectors of the jewelry industry – diamond manufacturers, dealers, retailers and potential customers. It had to be scientific, but also practical and applicable to the jewelry industry and public. GIA studied diamond cut for decades and analyzed tens of thousands of proportion sets before the system was introduced in 2005. GIA’s Diamond Cut Grading System for standard round brilliant diamonds in the D-to-Z color scale and the Flawless-to-I3 clarity range provides an objective assessment of a diamond's overall cut quality. There is no single set that defines a well-cut round brilliant diamond – many different proportions can produce attractive diamonds, which should be bright, fiery, sparkling and have a pleasing overall appearance, especially when the pattern of bright and dark areas is viewed face up, Gilbertson says. The remaining four components – weight ratio, durability, polish and symmetry – describe the design and craftsmanship.Įach cut grade – excellent, very good, good, fair and poor – represents a range of proportion sets and diamond appearances. The first three – brightness, fire and scintillation – describe the diamond’s appearance. When it comes to the 4Cs of GIA’s Diamond Grading System – color, clarity, cut and carat weight – cut is often the least understood because there are so many components considered in the cut grade. How close you hold it, and the environment you are in, affects the pattern you see.” “This all means that in every different location you look at your diamond, this ‘series of mirrors’ is reflecting not only the environment, but also you. By the time it gets very close, the area of dark pattern in the diamond has grown and is much more prominent.” Now, gradually bring it closer to your eye. Hold the diamond at arm’s length and look at how bright it is and how the pattern of dark and light appears. “Often times, the dark parts of the pattern you see in a diamond are a reflection of your face, or the camera – if you’re looking at a photograph,” Gilbertson says. When you look at your diamond, you are also seeing a reflection of the surrounding environment, including yourself. How – and where – you look at your diamond can greatly change its appearance.Īl Gilbertson, a GIA researcher, says if you think of a diamond like “a series of mirrors reflecting its environment,” it can help you understand how light and location can change the way your diamond appears. If you’ve ever wondered why your diamond looks different in sunlight versus candlelight or daylight versus office lights, it’s because the cut of your diamond responds differently depending on the light and the environment you are in. Fire is well illustrated in these loose diamonds that range in size from 2 to 3.03 carats. GIA’s Diamond Cut Grading system for round brilliant diamonds includes seven components: brightness, fire, scintillation, weight ratio, durability, polish and symmetry. Comprehensive CAD/CAM For Jewelry Certificate
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