Pearl Identification

In my view X-radiography + X-ray luminescence are useful tests for testing strands with a mixture of different types of pearls (natural pearls vs beadless freshwater cultured pearls) because today we are seeing a lot of Chinese freshwater cultured pearls in the market, possibly getting mixed them up with Southsea cultured pearls or with natural marine pearls. If doubtful always consult a reputed gem testing laboratory.