The “Big Pink Pearl” was discovered in 1990 by Wesley Rankin, a diver in Petaluma, California. It weighs 470 carats and because of its unique shape it is described as a baroque abalone pearl. Before 1996 this pearl was entered into the Guinness Book of World Records for being the largest abalone pearl in the world.
The origins of this pearl are unknown, however scientists believe that it comes from the red abalone species which are found all over the west coast and are the largest of the seven abalone species in California.
In 1991, the value of this pearl was $4.7 million. Rankin still owns it and is known as the largest abalone dealer in the world.