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
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