Contrast was achieved by using the Ash heartwood for the base and the lighter sapwood for the lining and inlay.
Here's a note we received from the new ring owners:
"It's a mountain ash tree that has been in his yard his entire life and is incredibly large and healthy--it has always been a significant tree to us and the family. It's so meaningful for us to have a connection to the actual place that we love the most through the rings that represent our love for one another. The rings will mean a lot to us, always, not only because of the significance of the wood itself, but also because of the care given in making them."