No one scene doesn't make them a porn star. I have spent time with many that had done a few scenes but didn't consider them porn stars.  In my opinion, they have to have some presence in more than one area (i.e a lot of internet porn from there own site) or that combined with something like Bangbros, RealityKings, Naughty America and mainline studio work.  They have to have done many scenes.  You mentioned some great ones so I will take the liberty at naming a few more ( ones I really like).  Kaylynn, Ashlyn Gere, Tori Black, Rachel Starr, Janet Mason ( who has come on string over the past year), Vicky Vette, Alaura Eden, Avy Scott  to name a few.  I think to be a certified platinum porn star you have to be into it. You have to like straight sex, girl on girl, threesomes, gangbangs and must do anal at least twice!  LOL    Anyway, good topic for conversation.

at least 4 years which serves as an analogy with graduating from college. In addition, the lady has to appear on the cover of the film she is doing at least 25 times in her career. Finally, the lady has to have won one award such as AVN or Xbiz award or at least been nominated for such awards.

This is my 2 cents.

Danni Woodward
Nikita Denise
Alexis Amore
Miko Lee

my opinion only

To be a star she has to be well known, and the directors want to work with the lady. Imagine an actress winning an AVN for her first seen. That would make her a star.

Mostly if its a porn star it should be someone you have heard of-  there are tons of girls who might do one scene for like you said Bang Bros or some other site- but I think you need something more than that to be considered a porn star

The term pornstar is used waaaaaaay to easily by women that have just done a scene on the internet or just one scene in a movie!