Hi, I had a similar problem, the colour in my dress went patchy. I didn't notice until I got home as nothing had been said to me in cleaners. I went straight back and they said cleaned it as per instructions and the dye probable wasn't set correctly by manufacturer. So I contacted manufacturer and they advised me to get a letter from the cleaner stating they cleaned it according to instructions and to send this along with dress to manufactuer (basically the designer) and they would test it for correct manufacturing (they could test if dye set correctly - colour fast I think). If it failed the test manufacturer would reimburse me if it passed to go back to cleaners.
Unfortunately I lost the letter cleaners wrote me in a house move so never got to send to manufacturer, but maybe you can ring the head office of the designer and ask them what to do. If the label says dry clean then it should be safe beads and all, if it can't be dry cleaned then how are you to wear more than once. Basically the blame lies somewhere other than yourself, form signed before cleaning or not. You are going on label and if it's not safe then it's the designer's problem.
Good Luck