Wow,you’ve got more questions the I have answers about pearls !!!
However,I tell you what I know about them.
Sweet water or fresh water pearls are exactly the same,another
misleading name I guess, trowen out by some people who wanted to
start a new bussines.They are more irrigular in shape then the
answer 1.The above mentioned text already clearifys this question.
answer 2.The differents between saltwater and sweet water is next.
Pearls (sweet and salt)are build up by tinny Calciumcarbonate
crystals and some organic substancy called “Conchiolyn”(binding
agency). Salt water pearls are in there modification calcite. Sweet
water pearls instead are in there modification Aragonite.
answer 3.Commonly pearls are found in moysters and some (??)
snails(conch,osmena,abalone). The commonly used moysters are"Pinctada
maxima moyster", “Pinctada fucata martensii”,"Pictada margaritifera"
and some more .
answer 4.Sweetwater pearls are found in a varity of colors with or
without a nice luster.starting from white,pinkish-white,pink and all
the way up to grey even blue.
answer 5.You got me on this one.There are farms all over the world
and for sure some welknown in America which I can’t recall right at
answer 6.Prices about fresh or sweetwater pearls are far not that
expensive as the salt water pearls are.Although,abalone pearls may go
up to 15,000 US$ for collectors items.The regular sweetwater pearls
start from a few dollars up to 30 US$.
answer 7.Sources to buy from are Oriental Crest(www.limitedition.com)
and Rio Grande has a small collection aswell (www.riogrande.com)
Hope that I cleared some questions about the sweet water pearls.