In the 1970's Rolex produced a very limited Day-Date with hand mixed colored enamels. These are known as "Stella Dials." There are four stories:

1) These dials were named after Frank Stella the prominent artist who worked with brightly hued enamels throughout the '70's.

2) The dial manufacturer was named "Stella".

3) "Stella" is a type of varnish.

4) In Latin "Stella" means Star or Star Like.

Manufactured primarily for the Middle Eastern Market, these brightly hued dials were not popular and Rolex end up destroying most of these dials, making them extremely rare highly collectible. 

These dials are inspired by the original Stella dials, and you receive both the custom color dial, as well as the original birth dial with the watch in most cases. If you wish to service the watch through Rolex, the original birth dial must be placed back in prior to presentation to Rolex.