Cave pearls are coated grains that form in shallow pools on level cave (or mine) floors. Low-Mg calcite (LMC) cave pearls growing between 2010-2014 in an underground limestone mine reveal amazing complexity of layers even for adjacent pearls in a single pool. We usually think of LMC as a stable mineral during early diagenesis, but these pearls recrystallized from LMC to LMC in months to years without significant changes in the pool conditions. This study has important implications for early diagenesis of lime mud to micrite.