Conversion of jewelry sizes

Often, the sizes of jewelry stones and rhinestones are not expressed in millimeters (mm) but in the dimensions “PP” (Pearl Plate) and “SS” (Stone Size). Both units are obsolete industrial dimensions.

Rhinestones in the size “SS 10” are, for example, not 10mm large, but only approx. 3mm.

Dimensioning of rhinestones

“PP” (Pearl Plate) is a method of sizing originally used for pearls by placing them on a surface or plate with holes. The pearls were sized by which holes they fell through. “PP” is usually used for smaller stones. The Pearl plate has a variance of 1/10 of a millimeter.

“SS” (Stone Size) is the most current method of rhinestone sizing, although PP is still used. Some stones are labeled with both sizes.

Please note: Smaller rhinestones are measured in “PP” (Pearl Plate) and flat backs and larger rhinestones are measured in “SS” (Stone Size).

Convertion PP, SS in Millimeter

For a simpler conversion, we have created the following table of dimensions:

SS sizes PP sizes Sizes in mm
SS 0 PP 1 0.80-0.90mm
SS 0 PP 2 0.90-1.00mm
SS 0 PP 3 1.00-1.10mm
SS 1 PP 4 1.10-1.20mm
SS 2 PP 5 1.20-1.30mm
SS 2.5 PP 6 1.30-1.35mm
SS 3 PP 7 1.35-1.40mm
SS 3.5 PP 8 1.40-1.50mm
SS 4 PP 9 1.50-1.60mm
SS 4.5 PP 10 1.60-1.70mm
SS 5 PP 11 1.70-1.80mm
SS 5.5 PP 12 1.80-1.90mm
SS 6 PP 13 1.90-2.00mm
SS 6.5 PP 14 2.00-2.10mm
SS 7 PP 15 2.10-2.20mm
SS 7.5 PP 16 2.20-2.30mm
SS 8 PP 17 2.30-2.40mm
SS 8.5 PP 18 2.40-2.50mm
SS 9 PP 19 2.50-2.60mm
SS 9.5 PP 20 2.60-2.70mm
SS 10 PP 21 2.70-2.80mm
SS 11 PP 22 2.80-2.90mm
SS 11.5 PP 23 2.90-3.00mm
SS 12 PP 24 3.00-3.20mm
SS 13 PP 25 3.20-3.30mm
SS 13.5 PP 26 3.30-3.40mm
SS 14 PP 27 3.40-3.50mm
SS 14.5 PP 28 3.50-3.60mm
SS 15 PP 29 3.60-3.70mm
SS 15.5 PP 30 3.70-3.80mm
SS 16   3.80-4.00mm
SS 17   4.00-4.20mm
SS 18   4.20-4.40mm
SS 19   4.40-4.60mm
SS 20   4.60-4.80mm
SS 21   4.80-4.90mm
SS 22   4.90-5.00mm
SS 23   5.00-5.20mm
SS 24   5.20-5.40mm
SS 25   5.40-5.60mm
SS 26   5.60-5.80mm
SS 27   5.80-6.00mm
SS 28   6.00-6.20mm
SS 29   6.20-6.40mm
SS 30   6.40-6.60mm
SS 31   6.60-6.80mm
SS 32   6.80-7.00mm
SS 33   7.00-7.20mm
SS 34   7.20-7.40mm
SS 35   7.40-7.60mm
SS 36   7.60-7.80mm
SS 37   7.80-8.00mm
SS 38   8.00-8.20mm
SS 39   8.20-8.40mm
SS 40   8.40-8.70mm
SS 41   8.70-9.10mm
SS 42   9.10-9.50mm
SS 43   9.50-9.80mm
SS 44   9.80-10.10mm
SS 45   10.10-10.50mm
SS 46   10.50-10.90mm
SS 47   10.90-11.30mm
SS 48   11.30-11.60mm
SS 49   11.60-11.90mm
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