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Pattye, the drill holes are pretty narrow but seems worn at the "mouth" of the hole. A bit funnel shaped. My guess is that the knots have been "eating" on the nacre during the years. That is a wild guess though... Conny

Sorry, I guess I was unclear above. The pearls in the necklace differs from the SS pearls. All pearls from necklace, tested by spectrometry had the spectra seen as the white line in the image above. All the SS pearls tested had a spectrum matching the violet line. Tahiti pearls had another very...

As I had no daylight to work in when getting to the lab I decided to make some other research... Here comes a photoluminiscence spectrum comparison between the pearls in the necklace and known south sea keshis. All pearls (6) shot from the necklace has close to identical spectra which pearls...

Thanks for your opinion Dave! Akoya keshi sounds interesting but I'm still not convinced they are not nucleated. Is it not possible they are nucleated and have spent a great deal of time in growth? I will dismantle the necklace and have it restrung anyway as I intend to give it to my youngest...

Yet another...

Another set...

Thanks Dave and Patricia. Sizes of pearls are from approximately 3 mm to 7.5/8.0 mm Here comes a first series of images. Same pearl different views.

Not sure if this is right place for this topic. If not I guess some of the moderators will move. I would like to mention the gemological use of the raman spectrometer as means of very fast distinguishing if dyed or natural, cultured freshwater pearls as well as coral and conch pearls. Anyone...

The answer is that I have not been able to see any nucleus through the drill holes. Usually one can see the borderline very easily in nucleated cultured pearls when drilled. That is why I guess the nacre is pretty thick. Conny

Absolutely, here comes a couple of quick shots under daylight lamp. The pearls are pretty dirty close to the silk and drill holes, sorry for that... :)

Hi you all, from a pearl "amateur". Though I'm a gemologist, diamond grader and precision cutter since more than 30 years pearls are not really my field of expertise. I love pearls and enjoy wearing my Tahiti pearl. The ones I consider primarily wearable by men as well as women. On to the topic...