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Hm, well, iridescence is hard to capture in a photograph. My first suggestion would be to shoot the images with natural light and not anything artificial and see if that gives him any better results. The image looks a bit over-exposed also, which is always a danger with a white subject when shooting with a camera on auto. Shooting in natural light may help there, also. If he's still having problems with over-exposure, he could try changing the background to something lighter - the camera seems to have exposed for the black item that the jigs are sitting on, thus over-exposing the jigs. Another thing, tell him to make sure he can see the iridescence when he is looking through the viewfinder on the camera, because it could also have to do with the angle the camera is viewing the jigs at.