How (shopping in hollywood) Cultured Pearls Developed

But until the end of the 19th century scientists and shell farmers were only able to produce blister pearls, or pearls attached to the inside of mollusk shells. This all changed when British-expatriate marine biologist William ... Even ventures outside of Japan in Australia, French Polynesia, Thailand, and Burma were under the direction of Japanese grafting technicians and operational specialists. Technicians swore an oath to never reveal the secret of pearl culture. ...