Other than that
Other than that, a look at the drilled holes in the beads will help. Since the pearl is formed naturally without a hole, the hole must be drilled. The surface of the pearl at the drill hole will not ‘sink in’ or ‘rise up’ as is seen in many fakes that are formed and coated with the holes already made to the core. In the real pearl, the nacre will be smooth with the drill hole and might even be chipped a bit. Some folks recommend having a dentist do an x-ray to see what is inside.
Still, unless a person is very, very familiar with reading the images the results are very iffy. A core will look like a core whether in a fake or a cultured pearl. A core will not be present to any large extent in a pearl formed freely in the ocean but those pearls just are not around or to be had except in very small sizes.
Using a good loupe (hand held magnifier) of 10 power is likely the best home test. Of course, try the teeth first! Then look at the drill holes and the surface compared to a good cultured pearl. There is not a one-in-all test I can recommend. Some of this will simply require some ‘pearls’ of real and fakes for comparison. When you look through a 10x maginfier at the surface of most fakes, the surface might look gritty, uneven, “orange peel” as in paints or even flaked off in small places.
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