Well, all goldies are adorable, regardless! But that is quite an unsual circumstance, considering you did buy her as a feeder fish, and we never would have thought she would have that gorgeous tail!
It happened by accident. Kara is our third fish, previously I purchased two small faintails but unintentionally I lead them to their death - the tank not cycled, lack of expertise in dealing with stressed fish, etc. So I decided to go this time with a cheaper fish and wanted a common - now after more than 6 months I am more aware of the fish keeping. So now she is enjoying her stay in her tank. In a month time she will be transferred to a bigger tank.