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I once did a full day thought experiment exercise with other science minded SF fans on evolving an alien. My alien needed three to tango and that was so much fun it stayed on the floor of the ocean and didn't bother to do any more evolving. But yes, there are many answers to the question of...

Octopuses do a sex thing and have eyes so the analogy is irrelevant to molluscs which don't and haven't. And why do different locations and different species have different colours, after millenia of evolution? Pearl nacre as in pearls harvested changes colour sometimes from harvest to harvest

While there are some pearl wholesalers in Bangkok my impression (from attending a couple of their gem shows) is that they aren't really very oriented (no pun) towards pearls. GIA in Bangkok does have some world-class pearl expertise though.

Lots on why nacre and discussion on biology but indeed, nothing on why different colours firmly embedded in that nacre. If you look at a Tahitian shell it is a dazzling rainbow of colours. Purple dye aside the colours in various freshwater hybrids are being developed rapidly. But all that colour...

But I never did get the answer!

I never did get an answer as to why some molluscs have colourful nacre.

But I didn't say such posts have to be ignored, just confined to a single thread. It was Douglas who initially punted such an idea. Most of the people who post new threads don't bother to read any previous posts or sticky information. I'm glad you enjoy responding. It's a thankless task. often...

As to limiting the never ending flood of ' I bought this off ebay for $1 and I think they are natural pearls' and 'I inherited these from...' Perhaps limit the starting of a new thread to someone with ten posts under their belt or somesuch - like posting photos is limited? Or we just agree to...

A few years ago I asked a top genetics biologist why shells and therefore pearls had colour in their nacre in some species, given that there was no male/female sex attraction thing going on; that it is mostly dark at the depths at which shells live: and no eyes to see the colours. But there they...

$180 would be a good price for dyed freshwaters imitating gold south sea. There are thousands of dyed freshwater strands on offer to the trade but most have a brown cast which is very noticeable when you see a tray of them.

For $300 you should be able to get a much nicer strand, even with today's silly Tahitian prices. (and, as you seem to be implying that that is a generic photo and therefore presumably the pick of the lot, what would your $300 deliver?)

Why go with what everyone else is doing? Come up with some innovative and more modern designs? Of all of those I prefer the clean lines of the ones towards the lower middle.

They're quite low quality, not much luster, or special colour, different shapes, lots of flaws.

Tahitians are the opposite of inexpensive at this moment.

They look like dyed freshwaters to me, though the photo is bad. At least ask for an in focus photo on a plain white background before you buy. What does the price tell you?

Made just up the road from me: https://www.towntalkpolish.com/ https://www.towntalkpolish.com/products/jewellery-care/pearl-and-delicate

What is the research project and under what academic umbrella? Is it images you want or actual pearls. It is fairly easy to obtain natural pearls from any of the websites which sell them.

They are stick pearls. They have a strip nucleus. Biwa pearls (pearls from the Japanese lake Biwa) used to be similar in shape but have largely disappeared due to pollution. But the name stuck and got applied to stick pearls from anywhere

Try super glue dissolver. Just splodge onto the glued bit and seal into a ziplock - leave for as long as it takes for the dissolver to work - can be a week. Ziplock needs to be as small as possible and squash out the air.

Works in Google. Don't see them so much these days.