Conch Pearls

 are pearls produced by the conch. They are one of the most valuable of all natural pearls and are extremely rare. Conch pearls contain no nacre which means that they are not proper pearls. Instead, the gems are calcareous concretions, similar to kidney stones in humans. Conch pearls and nacreous pearls have the same chemical composition the only difference between them is their polycrystalline structures.

Appearance
Conch Pearls are mostly pink but they can occur in a range of shades, including white, brown, orange, beige and ivory. The most valuable colours are deep rose red to salmon orange. Most conch pearls are baroque and it is extremely rare to find one perfectly round.