South Sea versus freshwater pearls
Page 1 of 1

Author:  gemlab [ Mon Apr 15, 2019 12:32 pm ]
Post subject:  South Sea versus freshwater pearls

I received a string of pearls for an appraisal and the client said they were sold as South Sea pearls for R200000 ($14250). The red flag went up due to the lustre and shape. The lustre appears to be too good for South Sea. They are a 'fat doughnut' shape and the size range is 10.50 - 11.00mm. I had them X-rayed but this was not conclusive as no nacre was clear enough to make a call. I then had a CT scan done on one of the pearls which indicates Freshwater. This will most probably end up in court, so I need to be absolutely sure of my facts.

I would appreciate any comments. Attached is a pic of the CT scan.

Image_4.jpg [ 336.88 KiB | Viewed 2161 times ]

Author:  Isi [ Thu Apr 18, 2019 4:43 pm ]
Post subject:  Re: South Sea versus freshwater pearls

Perhaps, a picture of the necklace and pearls might help.

If the case needs to go to court, a lab report might be necessary, to determine if the pearls are nucleated, and the chemical composition of the nacre : freshwater (with manganese) or saltwater (without).

Author:  John Fitzgerald [ Fri Apr 19, 2019 10:48 am ]
Post subject:  Re: South Sea versus freshwater pearls

Whatever happened to the idea that there would be test strips to check for manganese?

Page 1 of 1 All times are UTC - 4 hours
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group