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Five diamonds of different colors: 2 pear shaped, 1 kite diamond, 1 hexagon diamond, and 1 triangle shaped diamond


When it comes to choosing the perfect diamond, understanding the relationship between carat weight and millimeter (mm) measurements is crucial. This distinction becomes even more significant when considering the diverse range of diamond shapes available in both white and black varieties. In this blog, we’ll delve into the differences between carat weight and mm measurements, and provide a handy conversion chart for popular diamond shapes.

Carat Weight vs. MM Measurements:

Carat Weight:
Carat weight refers to the unit of measurement used to quantify the mass of a diamond. One carat is equivalent to 200 milligrams, or 0.2 grams. Traditionally, carat weight has been the primary factor influencing a diamond’s price, with larger carat weights generally associated with higher costs. However, it’s essential to note that carat weight alone does not determine a diamond’s size or appearance.

MM Measurements:
MM measurements, on the other hand, represent the dimensions of a diamond in millimeters. These measurements encompass the length, width, and depth of the stone and provide a more accurate depiction of its physical size. While carat weight provides a standard metric for comparison, mm measurements offer a clearer understanding of a diamond’s proportions, helping buyers visualize its presence on the finger.

Conversion Chart for Diamond Shapes:

Here’s a comprehensive conversion chart for various diamond shapes, detailing the typical mm measurements corresponding to different carat weights for both white and black diamonds:

Diamond Shape Carat Weight MM Measurement (White Diamond) MM Measurement (Black Diamond)

This combined chart offers a comprehensive reference for individuals seeking diamonds in the 1 carat, 1.5 carat, and 2 carat ranges across various shapes.


While carat weight remains a significant factor in diamond selection, understanding the corresponding mm measurements for various shapes is essential for making informed choices. By utilizing this conversion chart and considering both carat weight and mm measurements, buyers can accurately assess the size and appearance of both white and black diamonds, ensuring their satisfaction with their final selection.

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