American Set
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Millimeter to Carat Conversion Diamond Chart
Carat Round Marquis Princess Pear Oval Emerald Heart Triangle
mm mm mm mm mm mm mm mm
.25ct. 4.1 5x2.5 3.3x3.3 5x3 5x3 4.5x3.5 4x4 4.5x4.5x4.5
.30ct. 4.2 6x3 3.7x3.7 - - - - -
.35ct 4.5 - 3.8x3.8 - - 5x3 4.5x4.5 5x5x5
.38ct. 4.6 - - - 5x4 - - -
.40ct. 4.8 - 4x4 - 5.5x4     5.5x5.5x5.5
.47ct. 5 - - - - - - -
.50ct. 5.2 - 4.5x4.5 6x4 6x4 5.5x4.5 5.5 6x6x6
.60ct. 5.4 - 4.7x4.7 - - - - -
.65ct. 5.6 - - - 6.5x4.5 - 5.5x5.5 6.5x6.5x6.5
.75ct. 5.8 8x4 5x5 7x5 7x5 6x4 6x6 7x7x7
.80ct. 6 - - - - - - -
.95ct. 6.4 - - - - - - -
1ct. 6.5 10x5 5.5x5.5 8x5 7x5 7x5 6.5x6.5 8x8x8
1.25ct. 7 - 6x6 - - - - 8.5x8.5x8.5
1.33ct 7.2 - - - - - - -
1.50ct. 7.4 - 6.5x6.5 - 8x6 8x6 7x7 9x9x9
1.60ct. 7.6 - - - - - - -
1.75ct. 7.8 - - 9x6 8.5x6.5 - 7.5x7.5 9.5x9.5x9.5
1.90ct. 8 - - - - - - -
2ct. 8.2 12x6 7x7 10x7 9x7 8.5x6 8x8 10x10x10
2.15ct. 8.4 - - - - - - -
2.25ct. 8.6 13.5x7 - 11x7 - - - -
2.50ct. 8.8 - 7.5x7.5 12x7.5 - 9x7 8.5x8.5 -
2.65ct. 9 - - - - - - -
2.75ct. 9.1 - - 12.5x7.5 9.5x7.5 - - -
2.85ct. 9.2 - - - - - - -
3ct. 9.4 14x7 8x8 12x8 10x8 10x8 9x9 -
Please note that these are just approximate of measurements

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