Size Comparison Charts
Pencil Eraser Tip
Diameter = 6.5mm
US 10 cent coin
Diameter = 18mm
US 5 cent coin
Diameter = 21mm
US 25 cent coin
Diameter = 24mm
compared to
compared to
compared to
compared to
#30 Flat Copper
Diameter = 6mm
#80 Dome DNA
Diameter = 17mm
#90 Dome Gold
Diameter = 20mm
#100 Star Gold
Diameter = 22mm


Rhinestone and Nailhead sizing can be confusing.
It's a common complaint and we hope these size charts will help.
Rhinestone Size Chart
SS Size Millimeters Inches
Decimal 		Closest Approx
Inches Fraction
SS5
1.5
0.059
1/16 
SS7
2
0.079
5/64
SS9
2.5
0.099
1/10
SS12
3
0.118
1/8
SS16
4
 0.158
5/32
SS20
(4.5mm to 4.8mm)
4.5
0.177
 3/16
SS21 
5
0.197
 13/64
SS30
(6.0mm to 6.5mm)
6
 0.236
15/64 - 1/4"
SS34
7
0.276
 9/32
SS40
8
0.315
 5/16
SS42
9
0.355
11/32
SS48 
11
0.433
 7/16


Jewel and Cabochon Size Chart
MM Size Millimeters Inches
Decimal 		Closest Approx
Inches Fraction
11 11 0.433
 7/16
13 13 .512  1/2
15 15 0.591 19/32 
18 18 0.709 11/16
20 20 0.788
 3/4
22 22 0.867  7/8
25 25 0.985  1 inch
30 30  1.182 1-1/8
32 32  1.261 1-1/4
43 43  1.694 1-1/2
50 50 1.97 2 inches 
Nailhead Size Chart
# Size Millimeters Inches
Decimal 		Closest Approx
Inches Fraction
#12
3.5
.138
9/64 
#16
4.5
.177
 3/16 
#20
5
0.197
 13/64
#30
6
.236
 15/64
#40
9
.355
  11/32
#60
12
.473
15/32
#70
13
.512
1/2
#80
15
.591
19/32 
#100
22
.867
7/8 















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