| Generally, Oyster can purify the water. One oyster can filter ca. 30-40(?) liters of water per day.
The pollution is introduced by the farming method.
People in China begin to realize that it is very important to protect the air and water. I am glad to see the development in the last two years.
The small pearls become more expansive because the manpower are more expansive now. Small pearls need more manpower to process compared with large pearls. It is now also difficulty to find small pearls such as round pearls with diameter smaller than 2mm (because of new farming method?).
Predicting the price change is similar to predicting the stock market. I have checked my stocks, which are all red. So it is better for me to stay silent. One or two year later, one can find sufficient information to prove how the price has so changed.
I will open a new thread to show some pearls. |