"N" trademark on O pendant necklace...?

Does anyone know of a line of jewelry that used an N for the trademark? I'm pretty sure it is not an expensive line, like that used real diamonds or anything. The necklace I am referring to is an silver O pendant with little diamonds going around it(real or fake, not sure) on a silver chain. It has this N trademark on it, and also on a little tiny charm on the chain by the clasp. Anyone know this jewelery line? Thanks