I am afraid trading these three strands for a bracelet of nice, large ancient amazonite beads was a mistake.
Back at home suspicions aroused, and after unstringing one of them (see it here as the second pic) I am doubting them to be Venetian beads...although they do not look new.
The smallest is just 5mm x 2,5mm(!). Many are clumsy made. Most of them 4 layered, a few 5 and one 6 layered (12mmx11mm).
I would feel thankful for Forumite opinions.