These are indeed beads (see pics of the holes below).
They average about 1.3cm in diameter X .4cm thick.
I have a sample card that shows your beads. The distributor of Venetian beads sent it to me approx 1986-1990. I shared it on a facebook group this morning but the file is too large for here. Trust me, they are Venetian, said to be made in the Moretti factory. Mid to late 20th century.