Fern Coasters Fern Coasters Fern Coasters (39 ratings) Two drink mats £17.00 Quantity: at £17.00 each Add To Basket 1 in stock. My coasters are formed by fusing a single clear, opaque or coloured layer with a second more decorative layer. With these powdered glass has been used through a stencil to create the orange fern before firing in the kiln. They measure 10cm x 10cm (3.93 inches). Each one has 4 bumper feet to prevent the coaster sliding when used.