What did Mawu give to Lizzie the day before she attempted to escape to the North in the novel, Wench?

The Lucky Necklace is what Mawu gives to Lizzie the day before she attempted to escape to the North. The necklace is constructed out of thin metal, with birds carved around the length of the metal links. Although she doesn't believe in superstition, when Mawu is captured by the slave catchers, Lizzie fears that she has stolen her luck.