Cultured pearls are human creations formed by inserting a nucleus and a small piece of mantle tissue into a living shelled mollusc, usually a pearl oyster. Although many pearl observations intuitively suggest a possible rotation of the nucleated pearl inside the oyster, no experimental demonstration of such a movement has ever been done. This can be explained by the difficulty of observation of such a phenomenon in the tissues of a living animal. To investigate this question of pearl rotation, a magnetometer system was specifically engineered to register magnetic field variations with magnetic sensors from movements of a magnetic nucleus inserted in the pearl oyster. We demonstrated that a continuous movement of the nucleus inside the oyster starts after a minimum of 40 days post-grafting and continues until the pearl harvest. We measured a mean angular speed of 1.27° min−1 calculated for four different oysters. Rotation variability was observed among oysters and may be correlated to pearl shape and defects. Nature's ability to generate so amazingly complex structures like a pearl has delivered one of its secrets.
world will be your oyster. Some oysters have pearls inside them, and are therefore seen as … the anger or energy that has built up inside them: He doesn’t mean to get at you per¬ sonally
to these shells is that it has to be on guard inside them like a doorkeeper, and warn them when there is … older, one will find the shapes of small snails inside them, wherefrom grow the aforesaid Casques. I found … to get as large as 2 feet." One also finds pearls inside at times, just as is written about the Pimnae
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