If memory serves me, the railings were stainless steel and very bright with almost white sky reflections. Also between the vertical posts were sheets of thick glass, also reflecting bright images off them. Im not sure what rocks you are referring to that should be darkened because the glass in front actually has made them darker than they really were. The top row of glass has a greenish look to them. The lower ones are hardly visible but you can see the difference at the top left piece of glass on the left since the glass stops about 4 inches from the top horizontal rail.