Nacre (also called mother of pearl), is an organic-inorganic composite material produced by some molluscs. It is a hard, shining, iridescent material. It is formed in the inner shell of some of the more ancient lineages of bivalves, gastropods, and cephalopods to repair their damaged shells or to cover some objects inside of them. This is used by some pearl pickers, placing certain small items inside molluscs, knowing they will be covered in nacre, forming pearls or other valuable objects. The molluscs that produce the most beautiful nacre are the Abalone and the Nautilida, among other. Nacre is used in medicine for skin care, as an exfoliant.
The tusk represents human strength, and the ancestral connection with the animal's spirits, those who the humans, in the cradle of civilization, had to face to survive. The tusk of the defeated animal was worn, so its spirit was now at the service of the man. Carrying it in the neck symbolizes the ability to overcome adversaries, and the men's power to prevail in any situation. It's believed that it makes the inner strength arise, that connects us with elder powers and makes us invincible. It also increases the sexual appeal.