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There are a few factors that make up the overall quality of a diamond. Color is the first one. Diamonds are graded using a color scale that ranges from D (completely colorless) to Z (tinted yellow); the higher the color the brighter the diamond. The closer that you get to D the more valuable the diamond is. Clarity is another important factor. Most diamonds have imperfections also called inclusions, the fewer inclusions the better. The weight of the diamond, measured in carats is another factor. The larger diamonds are much rarer and increase in price. Proportions/symmetry is the last category that determines the quality of a diamond. There are two grading certificates for this; the HRD certificate and GIA certificate. These certificates grade proportions as unusual, good, or very good.

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