Mary Ann- Blue Fin is more blue than purple...but depending on the light it can have a lavender cast to it. Still it's more on the blue side.
High on my wish list for a possible bonus from Iris Sisters is one more nice blue in the sea/ocean/wave/river theme:
Adriatic Waves (photos from Iris Sisters & AIS wiki)
If I don't get it as a bonus I'll buy one next year. It was listed for $7 at Superstition this year...but they sold out!