The fastest way to get this item on Battle.net is via trading, you can use the Item Price Checker to see how much Telling of Beads is worth.
Farming it by killing monsters is possible, check the drop rate table below for more information.
It can also be gambled but the chances are very slim.
Telling of Beads drop rate table
The monster with the highest drop chance of dropping Telling of Beads is Andariel (Quest) on Hell difficulty in Catacombs Level 4 of Act 1. Farming the monsters listed below gives you the highest chance of finding that item.