It is rare to view pearls forming in converted caves. Under a small casade, on top of a stalagmite, small cavities dug out by the aggressive water of the first storms contain pearlsthat rotate each time raindrops touch them during the wet season.
The tiny grains of rock dust that originated the pearl have been little by little surrounded with concentric layers of white calcite and finally form big pearls that are continuing growing under our eyes. Alabaster layers, comparable to mother-of-pearl layers, are added one by one in the great black silence only disturbed by the lapping of raindrops.
As they receive the rain dripping from the vaults in winter, they develop very rapidly. It is likely that numerous pearls that have already been formed are ten years old since concretions are rapid in TRABUC caves.