It's probably a Phiten Necklace...made with titanium, and claims to provide health benefits, energy, etc... http://www.phitenusa.com/
Yes. Almost all babies "play" with their umbilical cords. They can't damage it or rip it in two if that's what you're worried about. They also do not wrap their own cords around their necks, that happens when they tumble around in there.
Tourists often have a camera around their necks.
Because they have lot of ball and socket joints to move around their necks.
No, it is an absurd falsity that all Jews carry a bag of change around their necks.
Maybe they do in Hawaii, but I have never heard of it. Often they will wear colored cords draped from their necks to show special honors and achievements, if that is what you were actually referring to.
A scarf!!
Neck Warmers.
Nooses
They wore them around their necks.
There are many things that tourists will wear around their necks. These things often include passports, cameras, and identification tags.
Vicars wear a cross around their necks as a symbol of their faith in Christ. Some crosses are very ornate, while others are very plain.