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Home » Learning Center » Stone Sizes
Gemologica Learning Center   · Diamonds
  · Gemstones
  · Gold
  · Settings
   · Stone Size
  · Ring Size
  · MM to Inches
  · Glossary

STONE SIZE

The following table shows common stone sizes, in addition to their corresponding total carat weight (i.e. CTW). Please note that the weights and sizes shown are approximate and should therefore only be used a rough guide.

Round CTW .50 .75 1.00 1.25 1.50 2.00 2.50 3.00
MM 5.0 6.0 6.5 7.0 7.5 8.0 9.0 9.5
Marquise CTW .50 .75 1.00 1.25 1.50 2.00 2.50 3.00
MM 7 X 4 8 X 4 10 X 5 10.5 X 5.5 11 X 5.5 12 X 6 13 X 6.5 14 X 7
Pear CTW .50 .75 1.00 1.25 1.50 2.00 2.50 3.00
MM 7 X 4 8 X 5 9 X 5 9.5 X 5.5 10 X 6 11 X 6.5 12 X 7 13 X 8
Oval CTW .50 .75 1.00 1.25 1.50 2.00 2.50 3.00
MM 6 X 4 6.5 X 5 7.5 X 5.5 8 X 6 8.5 X 6.5 9 X 7 9 X 7.5 10 X 8
Emerald CTW .50 .75 1.00 1.25 1.50 2.00 2.50 3.00
MM 6 X 4 7 X 4.5 7 X 5 8 X 5 8.5 X 5.5 9 X 5.5 9.5 X 6 10.5 X 6
Round CTW .01 .015 .04 .055 .11 .18 .25 .35
MM 1.3 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Baguette CTW .035 .05 .06 .075 .11 .15 .20 .25
MM 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Trillion CTW .10 .12 .15 .25 .30 .40 .50 1.0
MM 3.0 3.5 4.0 4.5 5.0 5.5 7.0 9.0
Princess CTW .05 .10 .15 .25 .30 .45 .60 1.00
MM 2.0 2.5 3.0 3.3 3.5 4.0 5.0 6.0
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