I am glad I have been helpful. Here are some more links to information about the pearl industry in Bahrain.
Before jewelers learned to cut gems, the pearl was of greater value than the diamond. In the Orient, pearls were ground into powders to cure anything from heart disease to epilepsy, with possible aphrodisiac uses as well. Pearls and Trade
The decline of the pearl industry in Bahrain had to do with the advent of cultured pearls from Japan, overfishing, and pollution.
Bahrain’s long association with pearls is the result of its amazingly fortuitous position. Located on the largest island in the Persian Gulf archipelago, the kingdom is blessed with over 400 square miles of oyster beds in the surrounding waters. Records show that as early as 5,000 years ago, fishermen were diving for pearls here. Some of the most priceless pearls in royal collections around the world were first pried from oysters in Bahraini waters and in its heyday, over a thousand ships were sent out to hunt for the pearls. Though Bahrain’s glory days as the biggest producer of pearls are past, it is still the world’s biggest pearl market.... HolidayCity Flash Travel Article: Looking For Pearls In Manama