I would like to create a shader that mimics the look of the beads appended below.
In the real world, these beads are clear leaded crystal with a fine metal powder having been heat treated on to various facets of the geometry. The result is that the bead is reflective on the outside, but you can see through it from behind the reflective coating.
The most important part is that the metallic finish fades to clear glass instead of either finish being uniform across the entire mesh, but still retains the ability to refract light.
I am particularly interested in fading from a gold metallic finish to an amber or sienna tinted glass.
How would I achieve a result similar to this using custom shader design?