Ruby is the name given to beans that contain chemical compounds that occur naturally in all cocoa beans that in Ruby beans occur in a specific ratio and above a minimum level to help create the ruby chocolate.

It tastes sort of like raspberries, again a flavour enhanced from the cacao beans.
The chocolate contains at least 47% cacao solids, this exceeds most milk and white chocolates (and some "dark" chocolate available in the supermarkets.)