 Some of the other contents of graves recorded by Hartman include two stone celts and a European-manufactured bead of blue glass.The latter indicates that the builders of the grave were alive during the 16th century.Skinner's excavations revealed ceramic vessels in the graves along with such other grave goods as incense burners, stone disks, meteoric iron gravers, flint stone knives, greenstone earspools, jade ornaments, a copper bell, carved stone statues and tables, celts, and even some gold or "tumbaga" objects.