A large natural pearl is very, very rare. Cultured pearls generally use a "core" of mother-of-pearl, the shell of the mollusk. The bead core goes into the mollusk and nacre is formed around the core. The core determines the overall shape of the pearl. How long the oyster is allowed to let the pearl grow determines the thickness of the nacre. Thicker nacre is better. Best of all is thick nacre and a smooth, almost blemish free surface.
Pearls grown inside the mussel or oyster do have a gritty feel to the tooth.
FAKE PEARLS
Do not use soap or water to clean vintage jewelry as soap leaves a residue over the metal and thus makes the metal and the stones look dull. Water damages delicate stones and the polish. Vinegar is also considered as a harmful cleaning agent. Do not leave your vintage jewelry wet, as it will lose its sheen. You must dry the pieces thoroughly before and after adorning it. Store your vintage jewelry in a dry place because dampness encourages rusts, verdigris, and other damaging conditions.
Be very careful while cleaning around enamel, as some old classic jewelry containing enamel coating will fade with destructive cleaning. You should also be extra cautious when it comes to cleaning colorful art glass because if you rub it aggressively then the coating might come off. Toothpicks are really good to clean small sockets or encrusted material; wooden toothpicks are safer than any metallic toothpick. So while hunting for a classic vintage set, be sure to understand its cleaning methods, as it is important to maintain it, it you wish to wear it daily or weekly.
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