In this case, a seam, or seam mark, refers to the area of the mold where it is opened. Most all planters have some type of seam. Depending on multiple factors such as age of mold, type of mold, chosen surface finish, and planter shape, seam marks may be visible on the casting. We do our best to limit the number of seams per product and to repair the seam marks so as not to interfere with the natural look of the product. Please contact us for more information on seams.