A necklace is a piece of jewelry used as a clothing accessoire.
In 2369 Vash secured a gold necklace she brought from her trip into the Gamma Quadrant in a storage locker of the assay office aboard Deep Space 9. (DS9: "Q-Less")
Vash herself later wore a necklace which was not put around her neck but attached to her earrings. (DS9: "Q-Less")
The Bajoran Kai Opaka gave Miles O'Brien her necklace including a pendant shortly before she left Deep Space 9 in 2369. He should give it to his daughter. (DS9: "Battle Lines")
Arbazan Ambassador Taxco wore a golden necklace during her visit aboard Deep Space 9. (DS9: "The Forsaken")
A necklace was one of the items stolen by a Dopterian thief in Quark's in 2369. (DS9: "The Forsaken")