How Do Oysters Make Pearls?

The video explains the origin and formation of pearls, which are used in jewelry. Pearls form when an irritant enters an oyster, prompting it to secrete layers of nacre around the irritant, creating a pearl. While many bivalves can produce pearls, oysters are particularly adept. The process involves the formation of a pearl sac and the secretion of nacre, primarily composed of aragonite. Cultured pearls are created by humans implanting tissue or beads into oysters to stimulate pearl formation.

What is the primary difference between pearls and other gemstones?

• Pearls are found only in freshwater.

• Pearls are made of pure carbon.

• Pearls are formed inside living organisms.

• Pearls are mined from the earth.

What initiates the formation of a pearl inside an oyster?

• A drop of water

• A piece of seaweed

• A small irritant

• A grain of sand

What is the role of nacre in pearl formation?

• It coats the irritant to form a pearl.

• It forms the outer shell of the oyster.

• It provides nutrients to the oyster.

• It dissolves the irritant.

How do cultured pearls differ from natural pearls?

• Cultured pearls are found only in freshwater.

• Cultured pearls are created with human intervention.

• Cultured pearls are formed without any irritant.

• Cultured pearls are always larger.

What is the main component of nacre?

• Sodium chloride

• Magnesium oxide

• Silicon dioxide

• Calcium carbonate