This bowl is an outstanding example of the spalting effect. Spalting occurs when wood has been left in wet condition. Nature takes its could and mineral deposits are left behind when the wood dries. This highly decorative effect is highly prized by collectors.
This piece is of beech is from the branch that fell in the garden.
Approximate dimensions 45mm x 175mm diameter ( 1 3/4″ x 6 3/4″ diameter).