Challenge accepted, and…Boom.
The rice grains do not change color when they are engraved, so you need a special backlight and zoom lens for the camera to photograph it.
(Otherwise it just looks like rough rice.)
This is the best I can get. We need a pro here.
(It will do text even smaller than that, but I can’t photograph it and need to put it under a little microscope thing to see it.)
edit: Okay, figured a better way of taking the shot, through a microscope: