DIAMOND CARAT TO MILLIMETER CONVERSION TABLE

Carat Round Marquis Princess Pear Oval Emerald Heart Trillions Tapered *
  MM MM MM MM MM MM MM MM Baquette MM

.005

1.00                
.0075 1.25                
.01
1/100		 1.50                
.0125 1.55                
.015 1.60                
.0175 1.65                
.02
1/50		 1.75 2 x 1 1.3 x 1.3            
.025 1.80                
.0275 1.90                
.03
1/32		 2.00 3 x 1.5 1.5 x 1.5            
.04
1/25		 2.20                
.045 2.30                
.05 2.40 3.5 x 2 1.8 x 1.8 3 x 2       2.5 x 2.5 x 2.5 3.5 x 1.25 x 1
.06 2.50 4 x 2   3.5 x 2         3.5 x 1.5 x 1
.07 2.70 4.5 x 2 2 x 2 3.7 x 2         3.5 x 1.75 x 1
.075 2.72                
.08
1/12		 2.75     3.7 x 2.5 3 x 2       3.5 x 2 x 1.25
.085 2.80                
.10
1/10		 3.00 4.5 x 2.5 2.2 x 2.2 4 x 2.5   3 x 2 3 x 3 3 x 3 x 3 4 x 2 x 1.5
.105 3.05                
.11 3.10                
.12
1/8		 3.20 5 x 2.5 2.5 x 2.5 4.5 x 2.5 3.5 x 2   3.2 x 3.2   4.5 x 2 x 1.5
.125 3.25                
.15
1/7		 3.40 5 x 3 2.8 x 2.8 4.5 x 3   3.5 x 2.5 3.5 x 3.5 3.5 x 3.5 x 3.5 5 x 2 x 1.5
.18 3.70 5.5 x 3   5 x 3 4 x 3 4 x 3   4 x 4 x 4 5 x 2.5 x 1.5
.20
1/5		 3.80 6 x 3 3 x 3 5 x 3.5 4.5 x 2.5       5.5 x 2.5 x 2
.25
1/4		 4.00 6.5 x 3.5 3.3 x 3.3 5.5 x 3.5 5 x 3 4.5 x 3.5 4 x 4 4.5 x 4.5 x 4.5 5.5 x 2.7 x 2
.28     3.5 x 3.5            
.33
1/3		 4.25 7 x 3.5 3.7 x 3.7 6 x 4 5.5 x 3.5       6 x 3 x 2
.35 4.50 7.5 x 3.5 3.8 x 3.8 6.5 x 3.5   5 x 3 4.5 x 4.5 5 x 5 x 5 7 x 3 x 2
.40
3/8		 4.75 8 x 4 4 x 4 6.5 x 4.5 5.5 x 4     5.5 x 5.5 x 5.5  
.50
1/2		 5.00 8.5 x 4 4.5 x 4.5 7 x 4.5 6 x 4 5.5 x 4.5 5 x 5 6 x 6 x 6  
.60 5.25   4.7 x 4.7            
.65
5/8
 5.50 9 x 4.5   7.5 x 4.5 6.5 x 4.5   5.5 x 5.5 6.5 x 6.5 x 6.5  
.75
3/4		 6.00 9.5 x 4.5 5 x 5 8 x 5 7 x 5 6 x 4 6 x 6 7 x 7 x 7  
.85 6.25 10 x 5   8.5 x 5   6.5 x 5   7.5 x 7.5 x 7.5  
1 6.50 10.5 x 5 6 x 6 9 x 5.5 7.5 x 5.5 7 x 5 6.5 x 6.5 8 x 8 x 8  
1.25
1 1⁄4		 7.00 11 x 5.5   9.5 x 6 8 x 6     8.5 x 8.5 x 8.5  
1.50
1 1⁄2		 7.5 12 x 6 6.5 x 6.5 10 x 6 8.5 x 6.5 8 x 6 7 x 7 9 x 9 x 9  
1.75
1 3⁄4		 7.75     10.5 x 6.5 9 x 6   7.5 x 7.5 9.5 x 9.5 x 9.5  
2 8.00 13 x 6.5 7 x 7 11 x 7 9 x 7 8.5 x 6 8 x 8 10 x 10 x 10  
2.25
2 1⁄4		 8.5 13.5 x 7   11.5 x 7          
2.50
2 1⁄2		 9.00 14 x 7 7.5 x 7.5 12 x 7.5 9 x 7.5 9 x 7 8.5 x 8.5    
2.75
2 3⁄4		 9.25 14.5 x 7.5   12.5 x 7.5 9.5 x 7.5        
3 9.5 15 x 7.5 8 x 8 12.5 x 8 10 x 8 10 x 8 9 x 9    
3.25
3 1⁄4		       13 x 8          
3.50
3 1⁄2		 9.75 16 x 8   13.5 x 8.5 10 x 8.5   9.5 x 9.5    
3.75
3 3⁄4		       14 x 8.5          
4 10.00 16.5 x 8.5   14 x 9 11 x 9 11 x 9 10 x 10    
4.50
4 1⁄2		 10.50 17 x 8.5   14.5 x 9 11 x 9.5   10.5 x 10.5    
5 11.00 18 x 9   15 x 9.5 12 x 10 12 x 10 11 x 11    
6 12.00   *Length x Top Width x Bottom Width

MILLIMETERS TO INCHES
MM = IN MM = IN
1.0 .0394 24 .9449
1.5 .0591 25 .9843
2.0 .0787 26 1.0236
2.5 .0984 27 1.0630
3.0 .1181 28 1.1024
3.5 .1378 29 1.1417
4.0 .1574 30 1.1820
4.5 .1772 31 1.2205
5.0 .1969 32 1.2598
5.5 .2165 33 1.2992
6.0 .2362 34 1.3386
7.0 .2756 35 1.3780
8.0 .3150 36 1.4173
9.0 .3543 37 1.4567
10.0 .3937 38 1.4961
11.0 .4331 39 1.5354
12.0 .4724 40 1.5748
13.0 .5118 41 1.6142
14.0 .5512 42 1.6535
15.0 .5906 43 1.6929
16.0 .6299 44 1.7323
17.0 .6693 45 1.7717
18.0 .7087 46 1.8110
19.0 .7480 47 1.8504
20.0 .7874 48 1.8898
21.0 .8268 49 1.9291
22 .8661 50 1.9685
23.0 .9055    
WEIGHT CONVERSION TABLE
From To Multiply By
Karats Pennyweight (dwt) 0.1286
Karats Grams 0.2
Grams Karats 5.0
Grams Kilograms 0.001
Grams Ounces, Avoir 0.03527
Grams Ounces, Troy 0.03215
Grams Pennyweight (dwt) 0.64301
Grams Pounds, Avoir 0.0022
Grams Pounds, Troy 0.00268
Inches Millimeters 25.4
Kilograms Grams 1,000.00
Kilograms Ounces, Avoir 35.274
Kilograms Ounces, Troy 32.1507
Kilograms Pennyweight (dwt) 643.014
Kilograms Pounds, Avoir 2.2046
Kilograms Pounds, Troy 2.6792
Millimeters Inches 0.03937
Ounces, Avoir Grams 28.3495
Ounces, Avoir Kilograms 0.02835
Ounces, Avoir Ounces, Troy 0.91146
Ounces, Avoir Pennyweight (dwt) 18.2291
Ounces, Avoir Pounds, Avoir 0.0625
Ounces, Avoir Pounds, Troy 0.076
Ounces, Troy Grams 31.1035
Ounces, Troy Kilograms 0.031103
Ounces, Troy Ounces, Avoir 1.0971
Ounces, Troy Pennyweight (dwt) 20.0
Ounces, Troy Pounds, Avoir 0.0686
Ounces, Troy Pounds, Troy 0.08333
Pennyweight (dwt) Karats 7.778
Pennyweight (dwt) Grams 1.5552
Pennyweight (dwt) Kilograms 0.00155
Pennyweight (dwt) Ounces, Avoir 0.05486
Pennyweight (dwt) Ounces, Troy 0.05

WEIGHT COMPARISON TABLE

To find the weight of an article in a metal different from that in which it is now made:

  1. Find the present metal in the first vertical column.
  2. Multiply the present weight by the factor in the same horizontal row under the new metal.
    Example: A sterling silver ring weights 8 grams; what will in weigh in 14KT?
  3. Along the horizontal row marked "STG", under the heading 14KT, we find 1.25.
    Example: 8 x 1.25 = 10 grams weight in 14KT.
  PR. F.G. 22KT 18KT 14KT 10KT 9KT F.S. STG
PR. 1.00 0.90 0.82 0.70 0.60 0.53 0.53 0.49 0.48
F.G. 1.11 1.00 0.91 0.78 0.67 0.59 0.58 0.54 0.54
22KT 1.22 1.10 1.00 0.86 0.73 0.65 0.65 0.60 0.59
18KT 1.42 1.28 1.16 1.00 0.85 0.76 0.75 0.69 0.68
14KT 1.66 1.50 1.36 1.17 1.00 0.89 0.88 0.81 0.80
10KT 1.88 1.69 1.54 1.34 1.14 1.01 1.00 0.93 0.92
9KT 1.90 1.71 1.56 1.34 1.14 1.01 1.00 0.93 0.92
F.S. 2.04 1.84 1.68 1.44 1.23 1.09 1.08 1.00 0.99
STG 2.07 1.87 1.70 1.46 1.25 1.11 1.09 1.01 1.00
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