Nickernuts or nickar nuts are smooth, shiny seeds from tropical leguminous shrubs, particularly Caesalpinia bonduc and C. major, both known by the common name warri tree. C. bonduc produces gray nickernuts, and C. major produces yellow. Accordingly, these species are locally known in the Caribbean as "grey nickers" and "yellow nickers". The word nicker probably derives from the Dutch word "knikker", meaning clay marble. The seeds are often found on the beach, and are also known as sea pearls or eaglestones.