These flat back nacre pearl stones have a half drilled hole in back with a smooth domed top. They're suitable for use as buttons or set them like cabochons. Nacre pearls from Preciosa Crystal offer an extraordinary resistance to abrasion, UV radiation and alcohol-based perfumes. Using strict quality standards, several layers of nacre are deposited onto a lead free crystal base, faithfully imitating the look of natural or cultivated pearls.

What is nacre? Nacre is a pearly fluid found inside pearl-producing mollusks, like oysters and mussels, that is deposited onto the surface of an irritant (usually a parasite) inside the mollusk shell. Over time, this self-defensive mechanism forms a pearl. Mother of pearl, which lines the shells of pearl-producing mollusks, is actually built-up layers of this hardened nacre.