Charles & Colvard Stone Size Comparison Chart

Updated 10 November 2026

Start with the stone’s measurements in millimetres. They tell you how wide or long it is, which is more useful for picturing it on your hand than a carat label alone. These charts describe the gemstone’s size, rather than the ring size you need for your finger.

The Charles & Colvard panels below are a legacy reference for dimensions and approximate weights. Check the specification and current availability of the particular stone you’re considering before ordering.

To see how different shapes look in a finished setting, explore our moissanite engagement rings and check the measurements for the stone size you select.

Understanding the chart labels

  • Millimetres (mm) describe dimensions. For a round stone, compare the diameter; for an oval or another elongated shape, read the length and width together.
  • Carats measure weight. One carat equals 0.2 grams. The row labelled MOI gives the chart’s approximate average moissanite carat weight.
  • Diamond-equivalent weight (DEW) is an approximate comparison with a similarly sized diamond. It is separate from the moissanite’s own weight.

How to compare two sizes

  1. Find the shape and cutting style you’re considering.
  2. Compare the millimetre measurements of two nearby sizes, checking both dimensions where they are given.
  3. Match those measurements to the stone offered for your chosen setting. Use its actual specification to make your final choice.

The drawings are not life-size on screen. Scroll sideways within each panel to see all the columns, and zoom in if needed. The weights are the supplier’s approximate reference figures, so they should not be treated as an exact conversion for every stone.

Round brilliant and round hearts & arrows

Charles & Colvard chart for round brilliant and round hearts-and-arrows moissanite: millimetres, average moissanite carat weight and diamond-equivalent weight.

Cushion, elongated oval, radiant, princess and Asscher

Charles & Colvard size chart for cushion, cushion hearts and arrows, elongated oval, radiant, princess and Asscher moissanite.

Marquise, heart, oval, square brilliant, pear, emerald and trillion

Charles & Colvard size chart for marquise, heart, oval, square brilliant, pear, emerald and trillion moissanite.

Rose cuts

Charles & Colvard chart for round rose, cushion rose, round duet rose, oval rose, marquise rose, rectangular cushion rose and pear rose cuts, including side views.

Old European, elongated cushion and side-stone shapes

Charles & Colvard size chart for Old European, elongated cushion, half moon, trapezoid, tapered baguette and baguette moissanite.

Larger stones in the Exotic Gems chart

Charles & Colvard Forever One Exotic Gems chart for larger round, round hearts-and-arrows, cushion, pear, oval, elongated oval, radiant and emerald shapes.

If you’re between sizes

Look at the whole ring as well as the centre stone. A halo, side stones and the width of the band all contribute to its appearance. If you can, compare similar settings on your hand and look at them from an ordinary viewing distance as well as close up.