I cannot see your pearl brooch but assume the pearls radiate in some floral pattern, perhaps on individual "stems" or as part of "flowers." If this is the case, you have some space between the pearls which will make cleaning easier. If the pearls are closely grouped covering much of the gold, cleaning will be more tedious and difficult.
I will get into specific cleaning in a moment: First, consider care and cleaning of pearls in general. In a nutshell, cleaning the brooch yourself will come down to baking soda, a good jewelry polishing cloth and a mild detergent. You may opt for a jeweler to do the cleaning. I will get into the specifics later.
"Pearls." Composition of a pearl and why care must be exercised in cleaning and wear. Pearls form naturally in both fresh and saltwater mollusks. The most well-known pearls are saltwater pearls formed inside various forms of pearl oysters. While "oriental" or totally natural pearls were the gems in ages past, pearl farming has led to a supply of cultured pearls which would be impossible from free ranging oysters and the efforts of pearl divers.
Only chance will bring a free swimming oyster to produce a pearl and only fortunate environment will lead to a natural pearl being well-formed, smooth surfaced and beautiful. In pearl farms, many conditions are controlled to help insure a good crop but today pollution in the waters are damaging the growth and supply of fine cultured pearls.
The pearl forms around some type of foreign object inside the oyster shell. In cultured pearls, the object is a bead of mother of pearl (pearl shell) placed into the oyster by pearl farmers. Seeing the object as an irritation, the oyster covers the object with layer and layer of a material called nacre. This is essentially the same material making the shiny and lustrous lining of the shell.
Pearl nacre is made of aragonite, a type of calcium carbonate. A sort of "pearl glue" holds together microscopic plates of aragonite. As long as the oyster is healthy, the nacre forms and becomes thick over the core, developing the luster and shine we recognize as a pearl.
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