i heard that in the usa people have special attitude to this kind of stones. if somebody finds a stone with one quartz line around (without any double lines and without the beginning and the end) he/she should trace the line with a finger and make a wish to make it come true. i don’t know if it works but these pebbles looks nice 🙂 i’ve found them on the riverside of danube during my last trip to germany – and i made some pendants for me and my friends 🙂