For the dielectric not looking like glass:
- If the IOR matches that of the glass(~ 1.47 to 1.65), and other parameters are at the dielectric defaults, dielectric looks pretty much indistinguishable from the built-in Glass (Solid) material, to my eyes.
- In the context of the tumblers in your reference image, for the ring-like light and shade, a gradient on the transmission channel won't yield that. Instead, a bit of Displace geometry using Marble textures with some subtle noise works for me, see my sample render and BIP file.
- Adding a ground plane didn't help much, my attached render is without any ground plane. Perhaps I'm misunderstanding the purpose the ground plane should be fulfilling.
- I am on KS 10.2, so couldn't open your BIP. However, here's mine, attached, if it helps.
One more thing: When using a color gradient for the Transmission channel of the Dielectric material, using 100% saturation results in a drastic difference in appearance, compared to using 99% or lower, for any of the color points of the gradient. Please see the material graphs for the two tumblers in my BIP file.