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Home > Diamond Education > Carats > Estimated Diamonds Weight Tables >


Estimated Diamonds Weight

Estimated Weight Of Round Brilliant Cut Diamonds

Round brilliant cuts : Carats = Diameter2 x Depth x 0.00609664

Gridle
  • Thin -2%
  • Thick +3%
  • Very Thick +5%
  • Extremely Thick +8%
Bulge
  • Visible +2%
  • Obvious +4%
  • Extreme +6%
Outline
  • Fat +2%
  • Very Fat +4%

Estimated Weight Of "Well-Made" Melee

Diameter, mm Carat Diameter, mm Carat
1.5 0.01 3.0 0.10
1.7 0.02 3.1 0.11
2.0 0.03 3.2 0.12
2.2 0.04 3.3 0.13
2.4 0.05 3.4 0.14
2.5 0.06 3.5 0.16
2.7 0.07 3.6 0.17
2.8 0.08 3.7 0.18
2.9 0.09 3.8 0.20
    3.9 0.22


Estimated Weight Of Round Brilliant Cut Diamonds (diameter 4.0-5.0 mm)

Diameter 4.0 4.2 4.4 4.6 4.8 5.0
Girdle TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK
Depth            
1.8 0.17 0.18 0.18                              
2.0 0.19 0.20 0.20 0.21 0.22 0.22 0.23 0.24 0.24                  
2.2 0.21 0.21 0.22 0.23 0.24 0.24 0.25 0.26 0.27 0.28 0.28 0.29 0.30 0.31 0.32      
2.4 0.23 0.23 0.24 0.25 0.26 0.27 0.28 0.28 0.29 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38
2.6 0.25 0.25 0.26 0.27 0.28 0.29 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.40 0.41
2.8 0.27 0.27 0.28 0.30 0.30 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.39 0.39 0.41 0.42 0.43 0.44
3.0 0.29 0.29 0.30 0.32 0.32 0.33 0.35 0.35 0.36 0.38 0.39 0.40 0.41 0.42 0.43 0.45 0.46 0.47
3.2       0.34 0.34 0.35 0.37 0.38 0.39 0.40 0.41 0.43 0.44 0.45 0.46 0.48 0.49 0.50
3.4                   0.43 0.44 0.45 0.47 0.48 0.49 0.51 0.52 0.53
3.6                               0.54 0.55 0.57
  Carats


Estimated Weight Of Round Brilliant Cut Diamonds (diameter 5.2-6.2 mm)

Diameter 5.2 5.4 5.6 5.8 6.0 6.2
Girdle TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK
Depth            
2.6 0.42 0.43 0.44 0.45 0.46 0.48                        
2.8 0.45 0.46 0.48 0.49 0.50 0.51 0.52 0.54 0.55 0.56 0.57 0.59            
3.0 0.48 0.49 0.51 0.52 0.53 0.55 0.56 0.57 0.59 0.60 0.62 0.63 0.65 0.66 0.68 0.69 0.70 0.72
3.2 0.52 0.53 0.54 0.56 0.57 0.59 0.60 0.61 0.63 0.64 0.66 0.68 0.69 0.70 0.72 0.73 0.75 0.77
3.4 0.55 0.56 0.58 0.59 0.60 0.62 0.64 0.65 0.67 0.68 0.70 0.72 0.73 0.75 0.77 0.78 0.80 0.82
3.6 0.58 0.59 0.61 0.63 0.64 0.66 0.67 0.69 0.71 0.72 0.74 0.76 0.77 0.79 0.81 0.83 0.84 0.87
3.8 0.61 0.63 0.65 0.66 0.68 0.70 0.71 0.73 0.75 0.76 0.78 0.80 0.82 0.83 0.86 0.87 0.89 0.92
4.0             0.75 0.76 0.79 0.80 0.82 0.84 0.86 0.88 0.90 0.92 0.94 0.97
4.2                         0.90 0.92 0.95 0.96 0.98 1.01
  Carats


Estimated Weight Of Round Brilliant Cut Diamonds (diameter 6.4-7.4 mm)

Diameter 6.4 6.6 6.8 7.0 7.2 7.4
Girdle TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK
Depth            
3.2 0.78 0.80 0.82                              
3.4 0.83 0.85 0.87 0.88 0.90 0.93 0.94 0.96 0.99                  
3.6 0.88 0.90 0.93 0.94 0.96 0.98 0.99 1.01 1.05 1.05 1.08 1.11 1.12 1.14 1.17      
3.8 0.93 0.95 0.98 0.99 1.01 1.04 1.05 1.07 1.10 1.11 1.14 1.17 1.18 1.20 1.24 1.24 1.27 1.31
4.0 0.98 1.00 1.03 1.04 1.06 1.09 1.11 1.13 1.16 1.17 1.19 1.23 1.24 1.26 1.30 1.31 1.34 1.38
4.2 1.03 1.05 1.08 1.09 1.12 1.15 1.16 1.18 1.22 1.23 1.25 1.29 1.30 1.33 1.37 1.37 1.40 1.44
4.4 1.08 1.10 1.13 1.15 1.17 1.20 1.22 1.24 1.28 1.29 1.31 1.35 1.36 1.39 1.43 1.44 1.47 1.51
4.6       1.20 1.22 1.26 1.27 1.30 1.34 1.35 1.37 1.42 1.42 1.45 1.50 1.51 1.54 1.58
4.8                   1.41 1.43 1.48 1.49 1.52 1.56 1.57 1.60 1.65
5.0                               1.64 1.67 1.72
  Carats


Estimated Weight Of Round Brilliant Cut Diamonds (diameter 7.6-8.6 mm)

Diameter 7.6 7.8 8.0 8.2 8.4 8.6
Girdle TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK
Depth            
4.0 1.38 1.41 1.45 1.45 1.48 1.53                        
4.2 1.45 1.48 1.52 1.53 1.56 1.60 1.61 1.64 1.69 1.69 1.72 1.77            
4.4 1.52 1.55 1.60 1.60 1.63 1.68 1.68 1.72 1.77 1.77 1.80 1.86 1.85 1.89 1.95      
4.6 1.59 1.62 1.67 1.67 1.71 1.76 1.76 1.79 1.85 1.85 1.89 1.94 1.94 1.98 2.04 2.03 2.07 2.14
4.8 1.66 1.69 1.74 1.74 1.78 1.83 1.84 1.87 1.93 1.93 1.97 2.03 2.02 2.06 2.13 2.12 2.16 2.23
5.0 1.73 1.76 1.81 1.82 1.85 1.91 1.91 1.95 2.01 2.01 2.05 2.11 2.11 2.15 2.22 2.21 2.25 2.32
5.2 1.79 1.83 1.89 1.89 1.93 1.99 1.99 2.03 2.09 2.09 2.13 2.20 2.19 2.24 2.30 2.30 2.34 2.42
5.4             2.06 2.11 2.17 2.17 2.21 2.28 2.28 2.32 2.39 2.39 2.43 2.51
5.6                         2.36 2.41 2.48 2.47 2.53 2.60
5.8                               2.56 2.62 2.69
  Carats


Estimated Weight Of Round Brilliant Cut Diamonds (diameter 8.8-9.8 mm)

Diameter 8.8 9.0 9.2 9.4 9.6 9.8
Girdle TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK
Depth            
4.6 2.13 2.17 2.24                              
4.8 2.22 2.27 2.33 2.32 2.37 2.44 2.43 2.48 2.55                  
5.0 2.31 2.36 2.43 2.42 2.47 2.54 2.43 2.58 2.66 2.64 2.69 2.77 2.75 2.81 2.89      
5.2 2.41 2.46 2.53 2.52 2.57 2.64 2.63 2.68 2.76 2.75 2.80 2.89 2.86 2.92 3.01 2.98 3.04 3.14
5.4 2.50 2.55 2.63 2.61 2.67 2.75 2.73 2.79 2.87 2.85 2.91 3.00 2.97 3.03 3.13 3.10 3.16 3.26
5.6 2.59 2.64 2.72 2.71 2.77 2.85 2.83 2.89 2.98 2.96 3.02 3.11 3.08 3.15 3.24 3.21 3.28 3.38
5.8 2.68 2.74 2.82 2.81 2.86 2.95 2.93 2.99 3.08 3.06 3.12 3.22 3.19 3.26 3.36 3.33 3.40 3.50
6.0       2.90 2.96 3.05 3.03 3.10 3.19 3.17 3.23 3.33 3.30 3.37 3.47 3.44 3.51 3.62
6.2                   3.27 3.34 3.44 3.41 3.48 3.59 3.56 3.63 3.74
6.4                               3.67 3.75 3.86
  Carats


Estimated Weight Of Round Brilliant Cut Diamonds (diameter 10.0-11.0 mm)

Diameter 10.0 10.2 10.4 10.6 10.8 11.0
Girdle TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK TN MD TK
Depth            
5.4 3.23 3.29 3.39 3.36 3.43 3.53                        
5.6 3.35 3.41 3.52 3.48 3.55 3.66 3.62 3.69 3.80 3.76 3.84 3.95            
5.8 3.47 3.54 3.64 3.61 3.68 3.79 3.75 3.82 3.94 3.89 3.97 4.09 4.04 4.12 4.25      
6.0 3.58 3.66 3.77 3.73 3.81 3.92 3.88 3.96 4.08 4.03 4.11 4.23 4.18 4.27 4.39 4.34 4.43 4.56
6.2 3.70 3.78 3.89 3.85 3.93 4.05 4.01 4.09 4.21 4.16 4.25 4.37 4.32 4.41 4.54 4.48 4.57 4.71
6.4 3.82 3.90 4.02 3.98 4.06 4.18 4.14 4.22 4.35 4.30 4.38 4.52 4.46 4.55 4.69 4.63 4.72 4.86
6.6 3.94 4.02 4.14 4.10 4.90 4.31 4.27 4.35 4.48 4.43 4.52 4.66 4.60 4.69 4.83 4.77 4.87 5.01
6.8             4.39 4.48 4.62 4.56 4.66 4.80 4.74 4.84 4.98 4.92 5.02 5.17
7.0                         4.88 4.98 5.13 5.06 5.16 5.32
7.2                               5.21 5.31 5.47
  Carats