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Diamond size guide

Carat is weight, not width. Two stones of the same carat can look quite different.

Last updated 21 September 2026

Diamond size, often confused with carat weight, is more accurately represented by its dimensions (length and width in millimetres). While carat weight indicates how much a diamond weighs (1 carat = 0.2 grams), the visual size of a diamond can varies based on its shape and cut. Understanding both carat weight and dimensions is crucial for making informed decisions when selecting a diamond.

Carat vs Size:

  • Carat: : Refers to the weight of the diamond, not its physical size.
  • Dimensions (MM): Represent the length and width of the diamond, providing a better indication of its visual size.

Diamond Size Charts:

  • MM to Carat Conversion: Diamond size charts typically correlate millimetre (MM) measurements with carat weight for different diamond shapes.
  • Example: A 6.5mm round diamond is approximately 1 carat, while a 7.3mm round diamond is roughly 1.5 carats.
  • Shape Variations: Diamond shapes (round, oval, etc.) have varying MM to carat ratios. For instance, an oval diamond of the same carat weight as a round diamond will appear larger due to its elongated shape.

Different Diamond Sizes as they appear on body

Complete Diamond Carat Size Chart

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