Bog Oak Earrings are from the oldest wood on the planet and also the most expensive. It survives in riverbeds underwater due to the lack of oxygen. The black colors are deep and rich due to the absorption of minerals. Some logs date back 5000 years to the times of the Pyramids. Earrings made from 2000 year old Bog Oak. Bog Oak Earrings feature 2000 year old wood. The wood is expensive as the process to bring them to market is so difficult. Usually the species is Oak trees.