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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...

The size, colour and surface quality suggest abalone origin.

I agree. Most epifaunal species rarely surpass a decade. Some epibenthic species may live longer. Geoducks can live up to 100 years, but they have a high resistance to predation and physical damage for living deep within the sediments.

You are correct in the context that differentiation is highly subjective. Objective differentiation is much more complex, even for scientists in those fields. Unravelling genetic codes (DNA) and micro chemical analysis have limitations, thus greater burdens are in place to be conclusive.

Judging by the numerous flat spots and visible centres, they appear to me as dyed grafted/re-grafted button nuclei. Polishing will make things worse.