These are blue sea glass and beach glass (naturally polished glass) collected from the shores of the Seto Inland Sea. Polished by waves and sand on the shore for several decades, they have become rounded, and their surfaces are like frosted glass, but they regain their original transparency when underwater. Each piece has a different size and shape, and no two are alike. They have been washed and dried after collection. Sea glass art, glass crafts, Power stone