The electrical charge of the hydrogen atom is thought to be exactly zero. This is a consequence of the apparent equality of the magnitude of the electrical charges of the electron and the proton, and their opposite sign.
Necklace definition, a piece of jewelry consisting of a string of stones, beads, jewels, or the like, or a chain of gold, silver, or other metal, for wearing around the neck. See more. Dictionary.com
gemstone - a crystalline rock that can be cut and polished for jewelry; he had the gem set in a ring for his wife; she had jewels made of all the rarest stones. gem, stone. jewellery, jewelry - an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)