Add punctuation: These natural pearls are oval shape The culture of the fresh water pearls exists since the Fifties in the north of KYOTO Japan in lake BIWA jap biwaco Into fresh water oysters Hyriopsis schlegeli one introduces only square pieces of epithelium of 4mm most of the time without core The exceptional size of these molluscs 20x11cm makes it possible to make there up to ten insertions in each half with sometimes another moreover comprising one motherofpearl core Each operation gives rise to a pearlbearing bag and its pearl At the end of one year the pearls have 6 with 8mm diameter and are seldom round They are withdrawn from oysters and are reintroduced to improve their shape
These natural pearls are oval shape. The culture of the fresh water pearls exists since the Fifties in the north of KYOTO (Japan) in lake BIWA (jap: biwaco). Into fresh water oysters (Hyriopsis schlegeli), one introduces only square pieces of epithelium of 4mm, most of the time without core. The exceptional size of these molluscs (20x11cm) makes it possible to make there up to ten insertions in each half with sometimes another moreover comprising one mother-of-pearl core. Each operation gives rise to a pearl-bearing bag and its pearl. At the end of one year the pearls have 6 with 8mm diameter and are seldom round. They are withdrawn from oysters and are reintroduced to improve their shape.