Unfortunately, I don't have a clear photo of this. However, you can make it out in a blurry fashion. I will try to get a better picture, but for now these will have to do:
As you can (kind of) see in this picture, Ralph's Grocery is starting to mark Ralph's brand products as gluten free (if they are, of course). The mark is the lower description and includes a crossed out wheat sign (similar to a "No Smoking" sign). The mirror effect picture is because it's all I could do on my MacBook.
Ralph's also has an entire page dedicated to eating gluten free eating. I haven't read all of the information, but it may be a good resource for your Ralph's shopping.
Ralph's L.A. Locations (Map)