So I modeled a watch, and I'm fairly new to Arnold. I've set up my shaders and so far it's turned out pretty well, except that the guts of the watch (hands, gears, etc) are reflecting back up onto the crystal. The result looks very strange and unrealistic, and I didn't have this problem with mental ray in Maya 2016.5. Any…
Try disabling Enable Internal Reflections in the Standard shader. As long as you have a recent Arnold, that will disable internal reflections both for mirror reflections and specular reflections.