Japan produced artificial pearls in the late 1920s /early 1930s. Bahrain people were then depending on pearl diving and that artificial pearls would have bad impact on Bahraini natural pearls. So, Bahrain government issued an announcement in 1931 preventing import of artificial pearls. Artificial pearls are still not allowed in Bahrain markets.
Translation of the announcement as it appears on the picture: “It is hereby notified to all residents of Bahrain that the import into Bahrain of artificial pearls made in Japan and other countries is strictly prohibited in order to prevent to occurrence of any cheating for the real pearls which are handled by the Bahraini merchants.
Any artificial pearls found by the government will be prosecuted.”