Handcrafted Stoneware Geo Pipe The Geo Pipe may be the most beautiful and most useful piece of stoneware you will ever own. Slip-cast by hand by ceramicist Ariel Zimman of Stonedware Company in Portland, OR. Better than glass, these lovely wares will not only give you a silky smooth pull, but they are a work of art for your coffee table. Black or Lime. Small, Medium, or Large sizes available.