Aside from Clarity, carat weight & color, perhaps the most important to determine the diamonds sparkle is how it is cut. Light Passes through the top or diamond table and is refrected at various angles to produce its sparkle and quality.
In the 19th and early part of the 20th century a "miner's cut" became popular. This was acheived by cutting the point of the diamond to fit snugly into certain settings. This process however, reduced the refraction of light or the diamonds sparkles. Therefore in today's diamond market, miners cut stone are less desirable and hence, less valuable.
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