Tiffany & Co. multiple chain strand floating heart toggle necklace. 14 1/2" long; choker length. Hallmarked on the bar part of the clasp. 59.3 grams. 

Comes with original box, bow, bag and cleaning instruction pamphlet.

This necklace as many of them are on the internet is tangled. One could twist it tight to hide the tangles, or if you are good puzzles, might be a great project. My worn out old hands are not up to the task.