Is a miraculous thing
A natural pearl begins its life as a foreign object, such as a parasite or piece of shell that accidentally lodges itself in an oyster’s soft inner body where it cannot be expelled. To ease this irritant, the oyster’s body takes defensive action. The oyster begins to secrete a smooth, hard crystalline substance around the irritant in order to protect itself. This substance is called “nacre.” As long as the irritant remains within its body, the oyster will continue to secrete nacre around it, layer upon layer. Over time, the irritant will be completely encased by the silky crystalline coatings. And the result, ultimately, is the lovely and lustrous gem called a pearl.
How something so wondrous emerges from an oyster’s way of protecting itself is one of nature’s loveliest surprises. For the nacre is not just a soothing substance. It is composed of microscopic crystals of calcium carbonate, aligned perfectly with one another, so that light passing along the axis of one crystal is reflected and refracted by another to produce a rainbow of light and color.
Cultured pearls share the same properties as natural pearls. Oysters form cultured pearls in an almost identical fashion. The only difference is a person carefully implants the irritant in the oyster, rather than leaving it to chance. We then step aside and let nature create its miracle.