The Iron Man      - Rolex is known to use the most exotic materials for their, in particular, Day Dates. We have seen  Bloodstone, Tiger's Eye, Onyx , Lapis and so on. The Ferrite is to be considered in the same group but  actually is not even a stone, it’s a ceramic material which is made by mixing and firing large amounts of iron. The color scheme usually starts from dark anthracite tones over to different shades of grey. The patterns very but mostly define horizontal lines, in one or the other way they are beautiful and very interesting, almost Zebra like configurations. Though its not really a stone, we see this among the stone dials as the properties are similar. This Ferrite dial with a beautiful anthracite-grey pattern and roman indexes with matching hands is presented in a yellow gold Day Date Ref.18238 featuring a double quick set movement. One of the rarer versions of the Day Dates in a  superb mint condition, hardly showing any wear from age