Most of the online resources i've read that explain pearl quality and grading seem to assert that in cultured saltwater pearls, a thicker deposit of nacre. As can be seen, the pearls appear distinctly. I don't think you could tell with tahitians because of the nacre not being transparent Twj, there is a relationship between luster and nacre thickness in that pearls with great luster usually have thicker nacre, but thick nacre is no guarantee of luster There is also the matter of how the crystals of aragonite are laid down. Nacre is a primitive characteristic that has been lost and regained throughout the mollusks' evolutionary history
The composition of nacre is unique within certain branches, and certain forms of nacre facilitate pearl production. There are no standards for nacre thickness in south sea pearl production, at least not in the way there is in french polynesia If the pearl is baroque it could definitely have thinner nacre on one side than the other, and thinner nacre does not mean the. Nacre thickness wasn't a sale point until it became a problem, was it Never found any report describing the nacre thickness of older akoya, just the cultivation times as already cited here, and assumed it is a reasonable guess to say that thrice the time means thrice the nacre thickness (or at least more then twice). So, obviously nacre is comprised of alternating layers of calcium carbonate (in the form of argonite) alternating with layers of biopolymers
He may peel the nacre to sell it, then reuse the nucleus Or apply a treatment to the pearl that will change its appearance and increase its value If the pearl is a good candidate for treatment, this is the most common and economically sensible approach for the farmer Mop also contains water and binding proteins secreted by the mollusks, the most important being conchiolin.
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