The Pearl of Lao Tzu (also referred to as Pearl of Lao Tze and previously as Pearl of Allah) is the largest known pearl in the world. The pearl was found in the Palawan sea, which surrounds the island of Palawan in the Philippines, and was found by a Filipino diver. It is not considered a gemstone pearl, but is instead what is known as a "clam pearl" or "Tridacna pearl" from a giant clam. It measures 24 centimeters in diameter (9.45 inches) and weighs 6.4 kilograms (14.1 lb).
While biologists would regard this object as a kind of pearl, gemologists regard it as a non-nacreous pearl, lacking the iridescence of the pearls that come from saltwater pearl oysters and freshwater pearl mussels. The interior of a giant clam has no nacre (mother of pearl); instead it is porcellaneous, like a china plate. Because of its great size, a giant clam can create a very large pearl, but not an iridescent, gemlike one. The Gemological Institute of America (GIA) and CIBJO now simply use the term "pearl" (or, where appropriate, the more descriptive term "non-nacreous pearl") when referring to such items, rather than the term "calcareous concretion" and, under U.S. Federal Trade Commission rules, various mollusc pearls may be referred to as "pearls" without qualification.
Famous quotes containing the words pearl, lao and/or tzu:
“Major Bagley: So they really got the Arizona.
Captain Quincannon: Yes, sir. Hickham Field was hit just as bad as Pearl Harbor, lot of fifth column work.
Major Bagley: I’ve studied all the wars in history, gentlemen, and I’ve never come across any dirty treachery like that.”
—Dudley Nichols (1895–1960)
“No one asks you to throw Mozart out of the window. Keep Mozart. Cherish him. Keep Moses too, and Buddha and Lao tse and Christ. Keep them in your heart. But make room for the others, the coming ones, the ones who are already scratching on the window-panes.”
—Henry Miller (1891–1980)
“Hence that general is skilful in attack whose opponent does not know what to defend; and he is skilful in defense whose opponent does not know what to attack.”
—Sun Tzu (6th–5th century B.C.)