Lil black pearls

[Oceania]

Hi,
Looking for some opinions from people who know far more than me.

I waved my uv torch at my fly stick pin's eyeballs this morning and the pearls lit up red which was very surprising to me.
I consulted Google and now I'm a bit confused. Some articles say that red pearls are cortez pearls but when I googled cortez pearls the articles I found said that they are modern pearls.
They are unlikely to be modern. The fly motif, the cut of the rubies in the eyes and the fact that it's a stick pin make me think that it's probably Victorian.
I have no idea about its provenance - I got it from my Dad about 15 years ago. He was very keen on estate sales and antique auctions.
I am relatively confident that they are pearls - they feel as I would expect them to do on my teeth


They are small - I would estimate that they are 2mm and 5mm

What type of pearls might they be?
Unfortunately my phone refuses to focus on the pearls with a blue light on a white background

 

[Pearl Dreams]

I wonder if they are natural Pteria sterna (Sea of Cortez) pearls?
@CortezPearls, can you weigh in?

It's the Independence Day holiday here in the US so it may be a little while before he is free to reply, but he's the guy to ask!

 

[pattye]

What a treasure you have, Oceania! Douglas will be able to confirm and tell us more! Good call, Pearl Dreams!

I'm fortunate to have several strands of Cortez Pearls; this is the exact glowing intense rose of my darker strand. My cell phone isn't picking up the color, sorry, or I would share a photo.

Here's some info from google:
"Around the turn of the 20th century, the pioneering Compañia Criadora de Concha y Perla based in La Paz Bay collected wild Pteria sterna (rainbow-lipped) and Pinctada mazatlanica spat. They successfully grew millions of these oysters to adult stages in suspended cultures.
However, these early operations were for mother-of-pearl (shell) harvesting and natural pearl collection. The technique of "seeding" or "grafting" an oyster to purposefully grow a cultured pearl was not yet performed in Mexico. These historic farms were subsequently destroyed during the Mexican Revolution."

 

[BWeaves]

I'm guessing the are natural found Sea of Cortez pearls. That fly stickpin screams Victorian era.