I just got back from Vietnam, researching Vietnamese pearl farms, a couple of weeks ago. I stayed in the north on HaLong Bay, but there are other areas of pearling in mid (Hue) and southern Vietnam (Phu Quoc). In all of Vietnam, there are lots of pearl "outlets", but many of them are selling Chinese freshwater pearls that they have imported. It is hard to tell which are truly Vietnamese pearls. The lore of Vietnamese pearls is that they are cultivated in cleaner waters and for a much longer time then the Chinese. I went to a dealer in HaLong City, called Viet Pearl. Truong Manh was the Vice Director and the office was at Cai Dam-Bai Chay, Ha Long City, Quang Ninh Province, telephone (+84.33) 3515 769. It was a fairly large retail store which sold everything from pearl creams for your face to very high end gorgeous pearls. The story I got and the video that was shown to me, was that they nucleate with only 1-2mm beads and harvest 8-8.5mm pearls. THIS WOULD MEAN THEY HAVE A NACRE OF AT LEAST 6MM! There were lots of lesser expensive pearls that couldn't have been that substantial of nacre, but I asked to see the top end and, god help me, but I went through every bag of pearls that those poor men had...I probably paid much more than I should have, but they are incredibly lustrous beautiful pearls. I also went to a pearl farm in HaLong Bay, by hiring my own junket for the day. I did get to witness the actual nucleation at this farm and the entire production. It was a pretty small farm, comparatively speaking, called Ha Long Pearl...oddly enough. If I can ever figure out how to upload photos, I would show you what I saw and even the pearls that I ended up selling my first born son for.