I am making a Stella and Dot cake. I have made the jewelry in candy clay and wonder if the decorations can go on buttercream. Or will the buttercream break down the chocolate? Also, she wants chocolate clay dots around the sides. Will they stick without falling off? TIA

No, the BC won't harm them at all. I used candy clay for the cow spots on this cake:

http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1310762

Cute cake! And thank you so much for your help!