This document discusses different types of pearls used in jewelry making. It describes the basic properties of pearls, including their composition and different shapes. The main types of pearls covered are Akoya pearls, freshwater pearls, Tahitian pearls, and South Sea pearls. Each type is described in terms of its characteristics, origin, colors, and rarity. The document also discusses the versatility and affordability of fashion pearls and costume jewelry, and lists reasons why learning to make or own a pearl necklace is worthwhile.