Rolex Day-Date Onyx Dial 18038The Black Stone Rolex This 18038 is a classic yellow gold single quick set Day Date with President bracelet. This is no ordinary Day Date however it is fitted with its original onyx dial, a black stone used by Rolex. It is a very mysteriousdial like looking into a black pool of oil! It is very rare to find an original onyx dial with the T SWISS T markings as they are very delicate and most on the market are later service dials. The cool non luminous