You're looking at a lovely test tube style glass vial necklace, filled with black salt.
Black salt is powerful magical tool. It is an invaluable product in any witch’s cupboard as it can remove negative energy from your property, remove unwanted guests and prevent them from returning back to you, protect you from the influences of negative relatives, colleagues, neighbors and all the like.
The silver toned necklace is 17" long, the vial with cap is 3cm in length. Note that the vials and the cap are sealed.