In any event, naturally forming or cultured
In any event, naturally forming or cultured, such pearls are formed in the oyster or mussel and are not fakes. The real difference in the totally natural pearl and the cultured pearls is what makes the pearl start to grow and the thickness of the nacre. Nacre is the pearly layers that make a pearl so lovely. The natural pearl will have very thick nacre, generally forming in concentric rings around some starting source or irritation to the mollusk. 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 are made by coating a core of some sort (mother-of-pearl, plastic, etc.) with a plastic, a kind of paint containing ground fish scales or other stuff that look pearly to the eye. Generally, the fakes do not have a gritty feel to the tooth. Most may be identified with a little practice and a 10x jewelers loupe or microscope. The way to do it is to compare real pearls with some known fakes. The fakes almost always show a grittier look to the surface and not the more smoothly formed natural nacre.
The look is grittier but the feel to a tooth is smoother. After some practice comparisons, most fakes are fairly easily identified. Still, some are hard to detect without very thorough testing sometimes using solvents and acids which attack the real pearl nacre but not the plastic fakes and visa versa.
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Tags: acids, blemish, concentric rings, free surface, memorable occasion, mussel