Fantasy book series involving 3 magic stones

Question

Fantasy book series from the 80's and maybe early 90's. Involved 3 magic stones, one in the forehead, 1 over the heart and one in the palm of the 3 main characters.

I can't remember much more of the plot details but I remember them being a great read.

Answer 1

That's Simon Hawke's (aka Nicholas Valentin Yermakov and J D Masters)'Wizard' series.
(Commonly referred to by the title of the first book, 'The Wizard of 4th Street.')

• The young man with the stone (one of three 'Runestones' in the books) on his forehead is Wyrdrune, a Warlock (read that as a low-level wizard; he was a very promising student, at one time, but.. things happened.)
• The girl with one on her palm is Kira, a sexy young thief,
• The mage with one over his heart is Mordred.
  (Yes; that Mordred -- From King Arthur's stories.)

Early on, Merlin (again, from King Arthur) helps them, but he is killed off early on...

only to re-appear and continue to work with them by possessing one of his descendants, a street-tough named Billy. They don't always get along.

Here are a few of the covers you may recognize.