First of all, it needs to be clear that Baroque pearl is an organic gem with unique shape and color. There may be some imperfect features on the pearl surface, such as small black spots, scratches or unevenness. These defects are usually due to the influence of the external environment during the growth of pearls, or the damage suffered during the collection and processing.
In addition, if baroque pearls are exposed to acid and alkali substances for a long time, their surfaces may undergo chemical changes and produce black spots. These spots usually cannot be recovered by routine maintenance, so special attention should be paid to avoid pearls from contacting these substances.
In a word, the black spots on baroque pearls may be natural defects or the product of chemical changes. If you find black spots when buying or wearing pearls, it is recommended to consult a professional jewelry appraiser or pearl seller for more information.