Just some questions...
1) I understand that the minimum nacre thickness for akoyas is .25mm and .8mm for tahitians. What is the minimum for south sea pearls? Anything official? Whati s currently being applied in the industry?
2) Thick nacre makes good luster. However, I recently saw a thin nacre coating in a small baroque south sea pearl (it's in a strand) through the drill hole (I'm estimating about .5-.8mm) but the luster of the pearl is great. If I'm not mistaken, good luster also may be produced by good nacre quality aside from nacre thickness. I'm assuming the pearls were still untreated as the strand is composed of bi-colored pearls and the overtone was a bit greenish to greyish but the luster is great and looks natural. Not sure though if there is a nice polishing agent that's been applied. Any thoughts?
3) Is Indonesia still producing much of the indicator pearls?