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Diamond, White Topaz is the Birthstone for April.
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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