Because of the way they’re formed, Keshi pearls are 100% solid nacre. They don’t contain bead nuclei like most other pearls. Which is why they’re considered non-nucleated and therefore non-cultured pearls.
What this means is that keshi pearls are exceptionally lustrous, as they’re made entirely of nacre and often have stunning orient or luster or both. The lack of a beaded nucleus also means that keshi pearls form in random shapes.
These factors make each keshi pearl unique and highly collectible.