How many pearl necklace general

Different length, different number of pearl size is different, the following data are for reference only, there is an error, to 43 cm around the pearl necklace, the 6.5-7.5mm is probably about 60, 7.5-8mm about 53, 8-8.5mm about 50 or so, about 47 or 8.5-9.5mm 45, or about 9.5-10mm.