Pear Shape Tolerances

Approximate MM
MM Range
Average Wgt
4X2.5
3.8-4.2 X 2.3-2.7
.10-.12 ct
4X3
3.8-4.2 X 2.8-3.2
.13-.14 ct
4.5X3
4.3-4.7 X 2.8-3.2
.15-.17 ct
5X3
4.8-5.2 X 2.8-3.2
.18-.23 ct
5.5X3.5
5.3-5.7 X 3.3-3.7
.24-.29 ct
6X4
5.7-6.3 X 3.8-4.3
.30-.38 ct
Pear Shape Tolerances

Princess Tolerances

Approximate MM
MM Range
Average Wgt
1.0
.88-1.09
.01-.018
1.25
1.10-1.37
.015-.02
1.5
1.38-1.67
.02-.03
1.75
1.68-1.87
.03-.04
2.0
1.88-2.18
.05-.06
2.25
2.19-2.37
.06-.08
2.5
2.38-2.67
.09-.11
2.75
2.68-2.87
.11-.14
3.0
2.88-3.18
.15-.17
3.25
3.19-3.37
.18-.22
3.5
3.38-3.67
.23-.28
3.75
3.68-3.87
.29-.33
4.0
3.88-4.20
.34-.44
Princess

Marquise Tolerances

Approximate MM
MM Range
Average Wgt
2.5X1.25
2.3-2.7 X 1.16-1.35
.015-.02 ct
2.5X1.75
2.3-2.7 X 1.65-1.89
.02-.04 ct
3X1.5
2.8-3.2 X 1.3-1.65
.025-.04 ct
3.5X1.75
3.3-3.65 X 1.65-1.88
.05-.06 ct
3.5X2
3.3-3.65 X 1.89-2.2
.06-.07 ct
3.75X1.75
3.68-3.88 X 1.65-1.88
.05-.06 ct
4X2
3.89-4.18 X 1.89-2.18
.07-.09 ct
4.25X2.25
4.2-4.35 X 2.2-2.35
.09-.11 ct
4.5X2.5
4.4-4.7 X 2.4-2.7
.11-.13 ct
5X2.5
4.8-5.3 X 2.3-2.8
.14-.17 ct
5X3
4.8-5.3 X 2.8-3.2
.18-.22 ct
6X3
5.8-6.3 X 2.8-3.3
.23-.28 ct
6X3.5
5.8-6.5 X 3.3-3.8
.29-.36 ct
Marquise

Heart Shape Tolerances

Approximate MM
MM Range
Average Wgt
3X3
2.8-3.2
.11-.17 ct
3.5X3.5
3.3-3.7
.18-.22 ct
4X4
3.8-4.2
.23-.28 ct
4.5X4.5
4.3-4.7
.29-.36 ct
Heart

Round Tolerances

Approximate Size CT
Diameter Range
Depth Range
Average Wt.
.0025
.80-.99
.55
.0022-.0038
.005
1.00-1.15
.71
.0039-.0064
.0075
1.16-1.23
.80
.0065-.0084
.01
1.24-1.40
.83-.88
.0085-.0125
.015
1.41-1.55
.94-.98
.0126-.0165
.02
1.56-1.80
1.01-1.10
.0166-.023
.025
1.81-1.88
1.15-1.18
.024-.027
.03
1.89-2.10
1.27-1.29
.028-.036
.04
2.10-2.23
1.31-1.37
.037-.045
.05
2.24-2.43
1.42-1.46
.046-.055
.06
2.44-2.50
1.55-1.59
.056-.066
.07
2.51-2.73
1.61-1.64
.067-.076
.08
2.74-2.80
1.64-1.68
.077-.087
.10
2.81-3.10
1.76-1.81
.088-.114
.12
3.11-3.23
1.85-1.89
.115-.134
.15
3.23-3.54
2.10-2.13
.135-.174
.20
3.55-4.00
2.26-2.30
.18-.22
.25
3.90-4.20
2.53-2.57
.23-.28
.33
4.20-4.60
2.64-2.68
.29-.36
Round

Oval Tolerances

Approximate MM
MM Range
Average Wgt
4X3
3.7-4.2 X 2.7-3.2
.15-.17 ct
4.5X3.5
4.3-4.8 X 3.3-3.7
.18-.22 ct
5X3
4.8-5.2 X 2.7-3.5
.23-.28 ct
5X4
4.7-5.2 X 3.7-4.2
.29-.36 ct
6X4
5.5-6.3 X 3.7-4.2
.37-.44 ct
Oval