The term cobalt comes from a treatment with cobalt-60 radiation. The nucleus of the pearl is made of freshwater mussel shell and freshwater shell contains manganese, which reacts with cobalt-60 radiation (saltwater shell has no manganese). The reaction causes the nucleus to turn dark, and this...
This is a bit last-minute, but Pierre Fallourd will be passing through Los Angeles this Sunday on his way back to Australia, and we’ve invited him to sit down with us for a conversation. We are going to be streaming live at 3 pm Pacific this Sunday.
Pierre spent about 15 years at Jewelmer, then...
The course is being rewritten now and we are adding natural pearls. American Freshwater is one of the modules.
This is the American strand from my personal collection.
They look like natural American freshwater pearls to me. I have a strand of these and they look very similar.
There are a couple of threads on PG where these have been discussed:
https://www.pearl-guide.com/threads/natural-mississippi-river-pearls-appraisal.3972/...
Hi Alex,
Jewelmer is one of the largest gold South Sea pearl producers in the world and farms on Palawan. They do accept visitors to their Flower Island resort - Flower Island Resort in Palawan (https://www.flowerislandresort.com/). Jewelmer does sell direct in the Philippines, but through their...
It's a piece of Hyriopsis cumingii with attached beaded freshwater pearls. They are called blisters. The pearls couldn't be harvested because they broke from the pearl sac and attached to the shell so the shell was cut up and used this way.