Haha. I've had that happen a lot to me, too.
A friend admired the two strands I was wearing, and I decided it was time for a little education. I explained how my rope were natural white Hanadama akoya pearls and my princess length strand were Freshadamas / gem grade freshwater pearls. She said the Hanadamas looked fake and the freshies looked real, because she was used to bead store "beads."