The ideal ratio for a Radiant cut diamond produces a slightly rectangular shape. The chart below gives you the weight and millimeter size conversions for the ideal radiant cut diamond.

Learn how carat weight is related to size with our diamond carat size chart. Breakdown by millimeter & shape. Tool + Printable PDF included.

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Carat Size Guide for a Round Cut Engagement Ring on a Size 4.5 US Finger. This guide illustrates how an Engagement Ring, Wedding Ring, Wedding Band, or Eternity Ring will look on a finger. It will help you choose which carat size will be the best for your engagement ring based on how it looks on a finger.

Diamond buyers often compare radiant cut and princess cut diamonds due to their similar outlines. Although these two cuts share some traits, several features set them apart. Let's discover the differences between radiant cut vs princess cut diamonds and see what aspects to consider when choosing between the two.