Onyx is translucent, nonporous, and completely smooth, the ideal material for a showstopping tub. There is even a counter-style ledge on this one-of-a-kind design, ideal for a glass of wine.

Inside the St. Paul City Hall/Ramsey County Courthouse is the largest carved onyx figure in the world. "I’m sure there are many people who have no idea that’s it even here," Nancy Wellington ...