Ok, I am confused... a few months ago White Diamond Tricoat was an option when you went to build the car on the Chevy website. They showed it as an option for two months or so, then it was gone from the color palet selection.
Fast forward three- four months....I just ordered a Black Granite LTZ sedan from the factory on Saturday. I was browsing on the chevy site and saw White Diamond Tricoat under "Model Overview, not under the build section. This prompted me to chat with chevy online. They informed me that it is available. I explained that it is not an option when you go to build the car on the site. They confirmed that they saw the same thing I was seeing. Although they were pretty certain it is available, they suggested that I contact the dealer so they can confirm with the GM Rep. Here is the thing, I just found out that the Black Granite car I ordered will go into production the week of 5/13. Knowing that, I should be able to change the color to White Diamond. This is crazy, if I knew that the White Diamond was available, I would have ordered that. Even the dealer did not have that color palet displayed in their big marketing book that is on the showroom floor. Either way, they are both really nice colors. I saw the White Diamond on the Malibu and it looked fantastic! I bet it looks awesome on a Sonic as well.