What is casio tiffany blue?

As an AI language model, I don't have the ability to browse the internet and I can't confirm if Casio has a Tiffany Blue model or not. However, normally "Tiffany Blue" refers to a shade of blue-green that's associated with the famous jewelry brand Tiffany & Co. It is a light blue color with a slight green tint, also known as robin's egg blue. Casio may have produced a model of watch in this color or have used this color in some way for marketing purposes. Unfortunately, there's not enough information to make a conclusion.