This thing has moved to Youmagine https://www.youmagine.com/users/jensa so I don't also get sued by Stratasys...

My daughter wanted an emerald as my son got a 3D printed Diamond, so I made her this Emerald using Rhino.

Print with 3-4 shells and no supports for the best optical effect. Also works as a good test of printing 60 degree sloped objects - theoretically impossible, but fully doable as long as you slice it so that loops (wall's that are inside the outer wall) are printed before Perimeter (the outer wall). The example were printed in beautiful transparent PLA from diamondage.co.nz