Jan's Jewelry Supplies

Stone Size Conversion Chart

Pearl Plate (PP) and Stone Size (SS)

    Millimeter Range
Inch Range Stones
PP SS Low High
Low High per Inch
1 000 0.800 0.900
0.0315 0.0354 29.88
2 00 0.900 1.000
0.0354 0.0394 26.74
3 0 1.000 1.100
0.0394 0.0433 24.19
4 1 1.100 1.200
0.0433 0.0472 22.09
5 2 1.200 1.300
0.0472 0.0512 20.32
6 2 1.300 1.350
0.0512 0.0531 19.17
7 3 1.350 1.400
0.0531 0.0551 18.47
8 3 1.400 1.500
0.0551 0.0591 17.52
9 4 1.500 1.600
0.0591 0.0630 16.39
10 4 1.600 1.700
0.0630 0.0669 15.39
11 5 1.700 1.800
0.0669 0.0709 14.51
12 5 1.800 1.900
0.0709 0.0748 13.73
13 6 1.900 2.000
0.0748 0.0787 13.03
14 6 2.000 2.100
0.0787 0.0827 12.39
15 7 2.100 2.200
0.0827 0.0866 11.81
16 7 2.200 2.300
0.0866 0.0906 11.29
17 8 2.300 2.400
0.0906 0.0945 10.81
18 8 2.400 2.500
0.0945 0.0984 10.37
19 9 2.500 2.600
0.0984 0.1024 9.96

PP SS MM Range
Inch Range SPI
20 9 2.600 2.700
0.1024 0.1063 9.58
21 10 2.700 2.800
0.1063 0.1102 9.24
22 10 2.800 2.850
0.1102 0.1122 8.99
23 11 2.850 3.000
0.1122 0.1181 8.68
24 12 3.000 3.200
0.1181 0.1260 8.19
25 13 3.200 3.300
0.1260 0.1299 7.82
26 13 3.300 3.400
0.1299 0.1339 7.58
27 14 3.400 3.500
0.1339 0.1378 7.36
28 14 3.500 3.600
0.1378 0.1417 7.15
29 15 3.600 3.700
0.1417 0.1457 6.96
30 15 3.700 3.800
0.1457 0.1496 6.77
31 16 3.800 4.000
0.1496 0.1575 6.51
32 17 4.000 4.100
0.1575 0.1614 6.27
33 17 4.100 4.200
0.1614 0.1654 6.12
34 18 4.200 4.300
0.1654 0.1693 5.98
35 18 4.300 4.400
0.1693 0.1732 5.84
36 19 4.400 4.500
0.1732 0.1772 5.71
37 19 4.500 4.600
0.1772 0.1811 5.58

SS MM Range
Inch Range SPI
20 4.600 4.800
0.1811 0.1890 5.40
21 4.800 4.900
0.1890 0.1929 5.24
22 4.900 5.100
0.1929 0.2008 5.08
23 5.100 5.270
0.2008 0.2075 4.90
24 5.270 5.440
0.2075 0.2142 4.74
25 5.440 5.610
0.2142 0.2209 4.60
26 5.610 5.780
0.2209 0.2276 4.46
27 5.780 5.960
0.2276 0.2346 4.33
28 5.960 6.140
0.2346 0.2417 4.20
29 6.140 6.320
0.2417 0.2488 4.08
30 6.320 6.500
0.2488 0.2559 3.96
31 6.500 6.680
0.2559 0.2630 3.85
32 6.680 6.872
0.2630 0.2706 3.75
33 6.872 7.069
0.2706 0.2783 3.64
34 7.069 7.272
0.2783 0.2863 3.54
35 7.272 7.482
0.2863 0.2946 3.44
36 7.482 7.700
0.2946 0.3031 3.35
37 7.700 7.927
0.3031 0.3121 3.25
38 7.927 8.164
0.3121 0.3214 3.16
39 8.164 8.412
0.3214 0.3312 3.06

SS MM Range
Inch Range SPI
40 8.412 8.672
0.3312 0.3414 2.97
41 8.672 8.945
0.3414 0.3522 2.88
42 8.945 9.232
0.3522 0.3635 2.79
43 9.232 9.534
0.3635 0.3754 2.71
44 9.534 9.852
0.3754 0.3879 2.62
45 9.852 10.187
0.3879 0.4011 2.54
46 10.187 10.540
0.4011 0.4150 2.45
47 10.540 10.912
0.4150 0.4296 2.37
48 10.912 11.304
0.4296 0.4450 2.29
49 11.304 11.717
0.4450 0.4613 2.21
50 11.717 11.970
0.4613 0.4713 2.14
51 11.970 12.220
0.4713 0.4811 2.10
52 12.220 12.470
0.4811 0.4909 2.06
53 12.470 12.720
0.4909 0.5008 2.02
54 12.720 12.970
0.5008 0.5106 1.98
55 12.970 13.220
0.5106 0.5205 1.94
56 13.220 13.470
0.5205 0.5303 1.90
57 13.470 13.720
0.5303 0.5402 1.87
58 13.720 13.970
0.5402 0.5500 1.83
59 13.970 14.220
0.5500 0.5598 1.80

SS MM Range
Inch Range SPI
60 14.220 14.470
0.5598 0.5697 1.77
61 14.470 14.720
0.5697 0.5795 1.74
62 14.720 14.970
0.5795 0.5894 1.71
63 14.970 15.220
0.5894 0.5992 1.68
64 15.220 15.470
0.5992 0.6091 1.66
65 15.470 15.720
0.6091 0.6189 1.63
66 15.720 15.970
0.6189 0.6287 1.60
67 15.970 16.220
0.6287 0.6386 1.58
68 16.220 16.470
0.6386 0.6484 1.55
69 16.470 16.720
0.6484 0.6583 1.53
70 16.720 16.970
0.6583 0.6681 1.51
71 16.970 17.220
0.6681 0.6780 1.49
72 17.220 17.470
0.6780 0.6878 1.46
73 17.470 17.720
0.6878 0.6976 1.44
74 17.720 17.970
0.6976 0.7075 1.42
75 17.970 18.220
0.7075 0.7173 1.40
76 18.220 18.470
0.7173 0.7272 1.38
77 18.470 18.720
0.72720.7370 1.37
78 18.720 18.970
0.73700.7469 1.35
79 18.970 19.220
0.74690.7567 1.33

SS MM Range
Inch Range SPI
80 19.220 19.470
0.75670.7665 1.31
81 19.470 19.720
0.76650.7764 1.30
82 19.720 19.970
0.77640.7862 1.28
83 19.970 20.220
0.78620.7961 1.26
84 20.220 20.470
0.79610.8059 1.25
85 20.470 20.720
0.80590.8157 1.23
86 20.720 20.970
0.81570.8256 1.22
87 20.970 21.220
0.82560.8354 1.20
88 21.220 21.470
0.83540.8453 1.19
89 21.470 21.720
0.84530.8551 1.18
90 21.720 21.970
0.85510.8650 1.16
91 21.970 22.220
0.86500.8748 1.15
92 22.220 22.470
0.87480.8846 1.14
93 22.470 22.720
0.88460.8945 1.12
94 22.720 22.970
0.89450.9043 1.11
95 22.970 23.220
0.90430.9142 1.10
96 23.220 23.470
0.91420.9240 1.09
97 23.470 23.720
0.92400.9339 1.08
98 23.720 23.970
0.93390.9437 1.07
99 23.970 24.220
0.94370.9535 1.05
100 24.220 24.470
0.95350.9634 1.04


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