The Inner Light NecklaceAntique sterling silver trimmed walnut pendant with a tiny ammonite inside. The chain is also sterling silver and is an exquisite old bar link with an antique hook closure. The ancient Roman author and naturalist, Pliny the Elder once noted "the shadow of the walnut trees is poison to all plants within its compass" because the fallen leaves and husks of the walnut produce a chemical that oxidizes in soil and impedes other plants ability to grow near