While waiting for word from hands-on experts, here is a quote from a reprinted article at KariPearls.com regarding the commercial practices at Eyris Blue Pearls:
Quote:
by Pam Hutchins FGAA
Wide Bay Valuation Services, Bundaberg
Blisters that attain the required thickness 0.3mm and over will be manufactured into and marketed as Eyris Blue Pearls™. In contrast, blisters having nacre of less than 0.3mm thickness will be manufactured and marketed Pacific Blue Pearls.
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It would be interesting to know how this compares with nacre thickness in quality mabés from pearl oysters.