Certain underwater races used pearls as currency rather than coins. The value of this currency changed according to several factors: the size of the pearl, measured from a standard of 0.25 inches (6.4 millimeters); its rarity; and quality. In the Sea of Fallen Stars, the value of a pearl was determined by its color:
white pearl, or "seyar": 1 cp undersea and 2 sp ashore;
yellow pearl, or "hayar": 1 sp undersea and 2 gp ashore;
green pearl, or "tayar": 1 gp undersea and 20 gp on land;
blue pearl, or "nuyar": 5 gp undersea and 100 gp on land;
olive pearl, or "olmar", 7 inches (18 centimeters) long, 3 inches (7.6 centimeters) wide, and diamond-shaped: 500 gp undersea and over 2,000 gp ashore.