Because there are less channels to go through in the supply chain, lab-grown diamonds can cost anywhere from 40 to 60 percent less than mined diamonds. Pricing is determined by the shape and, of course, the four Cs. According to the International Gemological Institute, diamonds with a sharper, more distinct colour grade will be more expensive. Graded on a five-level scale of excellent (light beautifully reflects) to poor (no sparkle), the shape, depth, and symmetry play a big role, too. Any imperfections in clarity can potentially alter the cost as well. The weight of the diamond is also a factor (the heavier the stone, the higher the price), as is the shape — round brilliant, the most popular diamond, is by far the priciest.
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