| Here is a chart for the size of a pearl and now many pearls are in an inch. This is approximation only and assumes no knotting.
To help with approximation, a 16 inch unknotted strand of pearls would finish out at 18 inch with double knotting and a clasp.
2.00 mm --- 12.70 Pearls
2.25 mm --- 11.29 Pearls
2.50 mm --- 10.16 Pearls
2.75 mm --- 9.24 Pearls
3.00 mm --- 8.47 Pearls
3.25 mm --- 7.82 Pearls
3.50 mm --- 7.26 Pearls
3.75 mm --- 6.77 Pearls
4.00 mm --- 6.35 Pearls
4.25 mm --- 5.98 Pearls
4.50 mm --- 5.64 Pearls
5.50 mm --- 4.62 Pearls
6.00 mm --- 4.23 Pearls
6.50 mm --- 3.91 Pearls
7.00 mm --- 3.63 Pearls
7.50 mm --- 3.39 Pearls
8.00 mm --- 3.18 Pearls
9.00 mm --- 2.82 Pearls
10.00 mm -- 2.54 Pearls
11.00 mm -- 2.31 Pearls
12.00 mm -- 2.12 Pearls
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