Ioun Stone, dusty rose Prism

[Morris Chan]

gives you +1 insight bonus to AC

can you have multiple of these?

do they boost your CMD?

[Starglim]

Morris Chan wrote:

gives you +1 insight bonus to AC

can you have multiple of these?

If you want, but insight bonuses don't stack.

Morris Chan wrote:

do they boost your CMD?

Yes.

[Derwalt]

Add it to a wayfinder and receive a further +2 bonus to your CMD, and a +2 bonus to your CMB :)

[Starglim]

Derwalt wrote:

Add it to a wayfinder and receive a further +2 bonus to your CMD, and a +2 bonus to your CMB :)

Belatedly, both the standard effect and the resonant power are insight bonuses, so the bonus to CMD doesn't stack, just replaces the +1 with +2.