Pearls have more value than diamonds. Pearls are produced deep in the water by oysters. As climate changes affect the oysters, pearls are very difficult to get. The quality of a pearl is decided based on its luster. This is because the quality of the pearl is natural and not due to any interventions like cutting or polishing. Its glow and beauty is entirely natural. Now people have started cultivating artificial pearls. Artificial pearls are very much similar to natural ones and not easily distinguished. This has made it affordable for many people. China, Japan and United States are the largest producers of pearls.