Did you know that the vast majority of freshwater pearls come from China? If you are like me, you'd probably curious what Chinese freshwater pearl farms look like and want to learn more about cultured pearls.
|Pearls of Joy's Presidential Lavender Freshwater Pearl Necklace|
He's also a great photographer as you can see from this night shot of Hong Kong, his first landfall before making his way to the pearl farming region.
The pearl farms are mainly located in prosperous Zhejiang province which is traditionally known as the "Land of Fish and Rice" although its industries are greatly diversified today.
The pearl farms are actually rice farms. When the rice fields are not being used for crops, the farmers cultivate freshwater mussels. What they choose to grow depends on what makes more money for them at the time. Fish also grow in these waterways which is also another source of income. During the 2008 economic downturn, the farmers went back to growing rice and fish. Many of these small farms are family-owned. The farmers sell the pearls to big pearl factory companies.
Most of today's freshwater pearls are grown in the Hyriopsis cumingi species which are commonly known as "triangle shells" for obvious reasons.
Freshwater pearls are not bead nucleated i.e. no starter beads are used. Something like 30-40 little bits of mantle tissue from a donor mussel's inner lining are added to each mussel and can yield as many pearls - far more than saltwater oysters. That's why freshwater pearls are more affordable - there are more of them.
As the starter material is not round, freshwater pearls are thus seldom round - only 2% are round or near round. On the plus side, freshwater pearls are virtually all pearl nacre - the mussel's secretion to coat what it considers an irritant. This coating is the beautiful and elegant luster we all like about this gemstone.
Nothing is wasted. The mussel meat is either eaten by the farmers' families or sold to canning factories. The shells are made into mother of pearl shell beads and decorations. The leftover shells are crushed and used in construction.
Freshwater pearls exhibit a range of natural soft pastel colors. The factors which influence color are not known. But what is certain is consumer preference. North Americans prefer white pearls while Asians like a silvery color. Shown below is the drop dead gorgeous gem quality multi-color Presidential freshwater pearl necklace from Pearls of Joy.
The apparatus shown above are typical simple centrifugal type of machines used to first separate the pearls from mussel material, clean and then polish. Bleaching is sometimes carried out. Some pearls are also intentionally dyed.
This large group of people are sorting pearls out. There is probably a simple size sorting machine available but nothing matches the human eye for color and luster subtleties.
Unfortunately, there is no universally accepted pearl grading system. The two most commonly used are the AAA-A system and the A-D or Tahitian system. Pearls of Joy uses the former. AAA, the top grade, is known as gem quality - "the highest-quality pearl, virtually flawless. The surface will have a very high luster, and at least 95% of the surface will be free from any type of defect. The pearl will be perfectly round, and have a mirror-like luster."
|The little machine in the front is a pearl reamer|
This great video is a short review about China's pearl industry.
Thanks Kevin for enlightening us on freshwater pearls!
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