In jewelry this term “string” is used to define a row of beads linked by a thread.
We can differenciate strings with pearls, corals, gold or any other material that can be carved with a whole in the middle in order to let the thread go through and therefore make necklaces or bracelets out of it.
In Salamanca and Leon (Spain), “string” is sort of necklace with strung beads with no high value.
Commonly the verb “to string” is used to define the action of sewing or weaving a string of pearls.
Images: @ Maria López-Linares Vintage Photography