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I'm just the messenger here. As a current subscriber to International Gem Society I was shocked to see their position but have found it to be an entrenched one, utilizing dated GIA reference (Liddicoat). Your good definition would also allow for pearl blisters, and abalone horns. Nuclei would be...

That works. Although an anklet charm comes to mind for these folks. In another thread it was shown that the specialized pearl and gemology trades are in basic disagreement over the definition of a pearl. Gemologists believe they must be nacreous, or be relegated to 'calcareous concretion'...

Spectral analysis is certainly a very good age indicator–of stars.

In refreshing my familiarity with the spectrum, red as a primary color requires the mollusk to come up with it on its own. Purple and gold would result in deep brown--a distinct marketing challenge, unless of course they were to be expressed as stripes...

I'm not seeing the flame, in Jeremy's hand or in the GIA shot. Surface actually looks pretty rough, but it is amazing the pearl retained its symmetry after what must have been decades in the pearl sac.

And to you for the incredible followup having a molecular background yourself! My contribution here is Google search related to the as-yet unrealized objective of sequencing white porcelanous (prismatic) pearls. To rehash an old thread, several years were spent here trying to prove or debunk...

Must await the certificate. Meanwhile perhaps you could advise provenance for the chest of mud.

It has every appearance of a nicely shaped, delicately colored and lustrous gastropod pearl (non-nacreous). Your name and screenshot indicate Turkish origin, can you tell us where you believe it was found?

Natural pigments also fade, thinking especially of porcelanous pearls such as Quahog (purple), Conch (pink), Melo Melo (orange). Owners of those rare treasures must be careful about storage and sun exposure.

Ab colors are more evident in this photo, there remains little doubt. In this case a freeform pearl, not a blister. Good find!

Very intriguing ring! While UV did not flouresce, the surface is classic P. Sterna 'hammered' texture. Maybe you should retry in a darker environment. Abalone can't be discounted, as roundish freeform examples do exist, although I would expect stronger green/blue. Your photos do pick up the...

Continuing my tendency to deviate threads, here is an actual MOP piano keyboard. Reality surpasses imagination! Henry Hawkey Pianos, NYC, 1850 Square Grand. MOP naturals with Rosewood sharps. AI was not far off—I just didn't specify Rosewood sharps! You can see the keytops are in two...

As long as the wearer is not a wildly gesticulating southern European it should stay in place for a while! Aside from the beautiful pearl, I am impressed by the concept of retaining visibility for the entire pearl surface. Always a pity to lose a beautiful pearl face in a setting.

Two finished pieces dropped off in the care of Jeremy and Hisano at Pearl Paradise yesterday. Fabulous PP photography! The act of setting a random lot of pearls versus meticulous matching has resulted in a tassel with an organic expression and natural feel. It's almost as though someone snagged...

@StarryPearl's 'Like' today offered a repeat glimpse of this image. As a pianist and former dealer in high-end European grand pianos it was a dream of mine to source MOP for piano keytops. Cutting and matching 52 sections of shell long and straight enough for the white keys on a standard...

I feel like that Kasumi is watching me.

Great shot of the Pteria shells under UV! The DNA technology would minimally serve to put to rest any lingering insecurity regarding Tahitian/SSP pearl substitutions. Another thought was how similar a recent posting of golden SS keshi looked to baroque Poe Pipi. If ever it became an issue...

DNA Fingerprinting of nacreous shell species has been around for about 10 years, so given sufficient economic or other motivation it is possible to confirm natural or cultured non-porphyrinic (!!) nacreous pearl species origin without any room for doubt. Douglas, does the pink glow extend to...

Also to eolian, the tails result in a corona-like effect. Very attractive. Jeg, is the feather pearl also Kasumi? It's a striking centerpiece.

A loop (bale?) at each end is a great idea! It could then double (triple?) as a bangle with the appropriate double-clasp chain. Swivel bales or clasps.