Ironstone china, also known as English earthenware, gained popularity in the mid-19th century for its durability and resemblance to porcelain. It was often used for everyday tableware and serving pieces due to its strength and resistance to chipping. Potteries in England frequently used the "Warranted Ironstone China" mark, sometimes accompanied by a crest, to signify the quality and durability of their products. This mark was particularly common during the Victorian era, and pieces bearing it are sought after by collectors for their historical significance and aesthetic appeal.