I completed sculpting the red gem for Shalamayne's hilt. I used 320 grit sandpaper to smooth the facets and try and give the edges a sharper look. I am going to do a little wet sanding with 400 grit sandpaper before I create a silicon mold. The better the surface now, the better the cast gem will look.
I plan to cast two red tinted clear gems, I might create a second pair with LEDs embedded in them.