In 1746, when the Empress Elizabeth passed the summer in Livonia, large quantities of pearls from the neighboring brooks were presented to her. But, owing to the cost of supervision, the expenditures soon exceeded the revenues and the government abandoned the guard and dismissed the fishermen. Little by little the search decreased, and by 1774 relatively few pearls were found.[237] According to Hupel, the Schwarzbach River, near Werro, was celebrated for its pearls, which were noted for their size and beauty; one of the tributaries of this river is named Perlenbach (Pearl Brook). The Ammat and Tirse streams, and forty other brooks and lakes also yielded them. Pearls of slight value were likewise produced in the Palze and the Rause, near Palzmar; the Paddez, a tributary of the Evest which empties into the Düna, and the Voidau and the Petribach, each of which flows into the Schwarzbach. Near the Tirse was a very old road house, patronized by the peasants, which from time immemorial had borne the name Pehrlu-kroghs (Pearl Tavern). Formerly some of the brooks of Esthonia on the Gulf of Finland, and principally those near Kolk and the adjacent lakes, furnished beautiful pearls. From these waters came the beautiful necklace which is yet an heirloom in the Kolk family. The choicest of these weighed from five to ten grains, and the color was grayish blue. The Emperor Alexander I is said to have received a present of pearls collected in the vicinity of Tammerfors, in the government of Tavastehus, in the grand duchy of Finland. The development of manufacturing in that region, however, has destroyed most of the mussels. Von Hessling notes that in the province of Olonetz, pearls are found in the Poventshanka, in the Ostjor, and in the Kums, where they are secured by the neighboring peasants who sometimes make valuable finds.[238] When the brooks dry up, the mussels are easily secured; old inhabitants note that on one occasion of this kind many superb pearls were found in the Poventshanka, and a necklace of them was presented to the Empress Catherine Alexievna. These pearls rarely leave the province in which they are collected, as the inhabitants are fond of using them for personal decoration. Young girls attend to the fishing, and workmen pierce them for about two copecks each. Choice ones sell for thirty to one hundred rubles apiece.