I found the item Biscuits' Sparkle, for anyone following.  With most of those, you could simply edit:duplicate object the jewel twice, scale one up to use as the aura, and use the other as an unseen IDL emitter.  How you set up the IDL emitter will depend on whether you're using P8/PP2010 or P9/PP2012.  In P5-P7, you can use a point light inside the jewel in lieu of IDL, and the aura will work.

     The material settings for the jewel itself will depend on which version of Poser you're using.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5