This is a beautiful antique bracelet! French jet was often used in the Victorian era for mourning jewelry, which leads me to believe that this was probably a piece of mourning jewelry. It is very unusual. It has 3 large, rectangular jet stones. The stones are faceted on both sides (one side has more facets than the other). Between the large stones are round stones and elongated jet stones. They are all connect by brass links.
The bracelet measures approx. 7.5 inches long and 13/16 inches wide at the center. It is in beautiful condition. The brass has a lovely antique patina, but would probably clean up if you like a shinier patina.