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Most closed shellfish rearing operations are ephemeral. Spat fall tanks two weeks... if that. Conditioning adults to spawning... less than a week and after spawning less than a month until they reach the pediveliger state. Then the juveniles are relayed out and the systems are drained...

Domestic aquariums as we know them are not suitable for rearing shellfish. Technically they are "down wells" where feces, bacteria and detritus are drawn through the substrate, then the filter and discharged at the surface. Shellfish rearing and feeding require up welling systems, thus aquarium...

Exporting live molluscs is illegal in most countries due to strict regulatory laws, namely public health and safety. Likewise importing it is prohibited under invasive species categories. I investigated this decades ago and the scientific permitting process was intensive and costly, which...

Yes, "in a sac" narrowed the scope erroneously on several pearl types. Even the term "blister" is too narrow because it encompasses other distinct types. There are three main subgroups... internal, external and a combination of both for onset. Each of these groups can be subdivided into other...

Relegation to concretion status is odd when several pearl types are elegantly foliated calcite, namely order Pectinidae and most gastropods. However those are pearls of natural origin. While natural pearl identification is a thing in the labs, the term non-nacreous stemmed from the cultural...

Using large, perfectly round natural gulf pearls to make imitation pearls is a novel idea.

The pearl is drilled, most likely repurposed. The bezel is factory rolled silver. The hand written spectral analysis is inadequate if not entirely bogus. Why photograph and submit a transcribed scrap of paper, when a photo of the lab certificate would have been infinitely simpler?

You state microscopic examination but have not provided supporting documentation of the type, examiner or protocol. You have also stated the items were aged, but have not provided evidence of this either. In either instance, these are not tests typically performed by jewellers instead by...

The xray views, though low resolution have visible bisected growth fronts at the nucleus. These are cultured pearls.

Non-uniform colours may support natural colour. And yes, bad dye might too. Beads are less likely to be resin filled, which is likely why your expert suggested natural. All good observations. Undersized holes can be made bigger with a diamond round file, but may affect how the bead nests later...

Does anyone see the year of seasons in the piece? Winter snow at the top, through spring flowers to summer days. Fall colours, then winter.

Yes a curious piece. Proveneance at face value, the pearls certainly would be natural. They do look natural at first glance merely by size. Very random in selection criteria although strict in the measure for uniformity to one another in size. They've been drilled so that very often means...

A healthy pearl sac needs to stretch a lot, hence juvenile cells tend to form uniformly over the entire surface. It's not a perfect world though. Spontaneous stretch marking isn't uncommon, thus replaced with calcite (as opposed to aragonite) at high times during a growth period. Over exertion...

What is the country of origin?

Having not seen these in person and taking your provenance at face value, they've scored equally in my cursory examination. Anything => 50% (natural v cultural) merits a trip to the lab. Possibly a mixed strand. Either way, it's a very nice piece. Thank you for sharing it with us.

It may sound good on the face of it, but as supply and demand issues are coupled with inflation and tariffs, the economy suffers. So long as farmers buy everything retail and sell everything at wholesale, more for less is not a good expectation.

Agreed. Upon cursory examination, it fails on most points. The dimple has some similarity, but absent of distinguishable growth frontage, so even on that point scores < 50%. Clearly, any expert worth their salt would not, nor could not arrive at this being a genuine pearl, no less of natural origin.

Thank you for the additional array of images. Which experts? Which tests? Was the "chest full of mud" wet, dry or a combination of both? How long was it in that situation? Please understand, I am scientifically objective in my approach to identification. thus unsupported subjectivity may be...

The imagery is inadequate for identification. Please revisit your photography by placing the object on a flat white surface and using a full frame macro setting. Likewise please provide other information, such as it's dimensions, where it originated, how you acquired it and any other useful...

I also agree. Natural colour is borne of protein, where dyes infiltrate calcite. Much of the fade in naturals results from occlusion by reverted calcite (as opposed to merely disappearing). The mantles (pearl sacs) of these are almost always the least possible thickness to be viable. As such...