Zambia Exports of pumice stone, emery, natural corundum, garnet, other natural abrasives to Botswana was US$200 during 2006, according to the United Nations COMTRADE database on international trade. Zambia Exports of pumice stone, emery, natural corundum, garnet, other natural abrasives to Botswana - data, historical chart and statistics - was last updated on May of 2024.