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Diamond Size Calculator

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The Diamond Size Calculator helps individuals estimate the physical dimensions of a diamond based on its carat weight. This tool is useful for jewelers, buyers, and enthusiasts who want to understand how carat weight translates into actual size. It simplifies the process of determining the millimeter diameter or measurements of a diamond, depending on its cut and shape.

Formula

Diamond Size

where:

  • Carat Weight is the total weight of the diamond in carats.
  • Standard Size Factor depends on the diamond shape (e.g., 6.5 for round diamonds).
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Approximate Diamond Size for Different Carats (Round Cut):

Carat WeightApproximate Size (mm)
0.254.1
0.505.1
1.006.5
2.008.2
3.009.3

Diamond Size Reference Table

This table provides estimated diamond dimensions for various shapes and weights.

Diamond Shape0.50 Carat (mm)1.00 Carat (mm)2.00 Carats (mm)
Round5.16.58.2
Oval5.3 x 3.87.7 x 5.710.5 x 7.0
Emerald5.0 x 3.57.0 x 5.09.0 x 6.5
Marquise7.5 x 3.510.5 x 5.014.0 x 7.0
Cushion5.0 x 5.06.5 x 6.58.5 x 8.5

These values serve as general guidelines for estimating diamond sizes based on carat weight.

Example of Diamond Size Calculator

A buyer is considering purchasing a 1.5-carat round diamond and wants to estimate its size.

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Using the formula:

Diamond Size (mm) = (1.5)^(1/3) × 6.5

By solving for the value, the estimated diamond size is approximately 7.3 mm in diameter.

This helps the buyer visualize the diamond size before making a purchase.

Most Common FAQs

How does carat weight affect diamond size?

Carat weight influences the overall dimensions of a diamond, but shape and cut also play a role in determining its actual visual appearance.

Are two diamonds with the same carat weight always the same size?

No, different diamond shapes and cuts distribute weight differently, affecting their perceived size and face-up appearance.

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