Excellent "See-thru" Lighting option for Vanity To
I am a fabricator.
Just sharing info. It is possible to illuminate onyx vanity tops from underneath and have a "glowing" countertop.
This feature has been around a long time but it was always problematic when incandescent or flourescent lighting was used due to space, heat, and servicability issues.
In the last few years LED based lighting products have become available that allow lighting the underside of onxy vanity tops with no heat issues and projected lifetimes of 50,000 hours for the actual lights.
This is a beautiful effect and the LED based lighting products also allow using a dimmer.
We have also done this for bar tops and full height splash. It's not particualrly complicated or difficult but it does require coordination between the cabinet and granite guys and also judicious selection of the onyx or other material to insure you'll get enough light transmission.