Carat weight is the most obvious factor in determining the value of a diamond.
The weight of a diamond is measured in carats. One carat is divided into 100 "points," so that a diamond of 75 points weighs .75 carats. Two diamonds of equal carat weights can have very different prices, depending on their quality. Diamonds of all qualities can be found in all size ranges.Since diamonds are measured by carat weight, and not size, two diamonds of the same weight could have different sizes.
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Carat Weight
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1 carat
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=
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100 points
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3/4 carat
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=
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75 points
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1/2 carat
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=
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50 points
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1/4 carat
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=
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25 points
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Why? If a diamond is cut too shallow (or flat) it will have a larger diameter, shallow depth and therefore will appear larger. Likewise, if a diamond is cut too deep (or pointed) it will have a smaller diameter and deep depth and therefore will appear smaller. This is why cut is so important.
You want to make sure the diamond is cut to proper proportions. Not only does it make a large difference in the diamond's ability to reflect light, but a poorly cut diamond will not be proportionate in size to a diamond cut to proper specifications.
For example, let's say you're interested in a 1.00ct diamond solitaire with a table of only 49%, the diamond will be cut way too steep and will look like a .80ct diamond instead.
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Carat Weight vs. Size
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1 Carat
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.80 Carat
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Diamonds weighing differently can look the same size due to cut.
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Well-Cut Diamond Sizes
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3.00
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2.50
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2.00
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1.50
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1.00
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.75
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.50
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.25
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