MaggieMays created a necklace using natural Mother of Pearl that you can "Adorn any ensemble beautifully with a striking piece of jewelry, that you can wear with a green conscience, knowing you are respecting our precious environment." A endless strand necklace with no worry about trying to clasp. It would make a wonderful gift for those who have arthritis or a disability that would help with from having to finagle with closing clasps.
Where does Mother of Pearl originate - Nacre also known as mother of pearl, is an organic-inorganic composite material produced by some mollusks as an inner shell layer; it is also what makes up the outer coating of pearls. It is very strong, resilient, and iridescent (shows a colorful back on each shell).
Here is a picture of the Nacre otherwise known as Mother of Pearl: