Determining natural pearls from cultivated pearls
Natural pearls are more valuable than cultured pearls. Jewellers x-ray the pearl to determine whether it is cultivated or natural. A cultivated pearl has a perfect sphere in the centre of its grit. Cultivators usually insert a perfectly round shaped grit in the shells to produce an expensive, perfectly round pearl. Understandably, genuine pearls do not have perfectly round centre. Some jewellers also create imitation pearls. These are made of mother of pearl, coral, conch or are made from glass, which are coated with a solution made of fish scales. These imitation pearls may look as real ones, but they are distinguished from its weight, smoothness and lustre.