The single strand comprising thirty-one cultured pearls graduated from 15.0 mm to 12.0 mm, in shades of grey, joined to a pav??-set diamond ball clasp, mounted in 18k white gold, length 17 1/2 inchesWith report 1182927537 dated 21 December 2017 from the Gemological Institute of America stating saltwater beaded cultured pearls, natural body colour. No indications of treatment.