Invisibility and Ioun Stones

[Cloudgatherer]

Does an Ioun Stone floating in the air turn invisible when the character turns invisible? Example: mage casts invis with an ioun stone floating about. Does the stone disappear also (so now we have a floating, invisible, ioun stone)?

Thank!

 

[Varius]

All of the characters equipment turns invisible, including the Ioun stone.