Hi :)

It largely depends on the lighting. I usually use a dark burgundy for color, intensity between 50-70%, Diffuse Reflection in the 90's, translucency 30-45%, refraction about 30%, Fresnel -- about 20%

But all that needs tweaking depending on the lighting. I also render SSS in the multi-pass layers, so that I can adjust intensity in postwork, and that takes care of a lot of tweaking.

Hope this helps.