The Shell Pearls are not cultured or natural pearl, the shell pearls are entirely organic (not a simulated material) made of nacerous tissue from the same oyster that cultured Sea Pearl are made from. The luster is 'Superior', the matching 'Excellent', the surface quality is 'Excellent' Shell Pearl, AAA Grade,good quality ,high luster ! (Professional Hand Knotted By Double Silk Threads Between Each Shell Pearls) Material shell pearl Necklace, bracelet and earring Length 7.5" 18" Inv74706