freshwater or akoya pearls:
 A. White freshwater pearl: size 9.5-10.5 mm ø, 46cm long
 B. White akoya pearl: size 6.5-7 mm ø, 43cm long
 C. Gray freshwater pearl: size 9 -10 mm ø, 43cm long
 D. Gray freshwater pearl: size 7-7.5 mm ø, 43cm long
 Lock: stainless steel or gold plated, mat or polished