The European name for a type of Japanese porcelain made in Arita and exported from the port of Imari. It is usually richly painted with the characteristic palette of underglaze blue, red, and gold, occasionally with green, manganese, and yellow added. Although first exported in the late 17th century, Imari porcelain continued to be made until the early 20th century. ‘Japan’ pattern, as it was known, was popular in England and much copied and improvised, especially at Worcester, Spode, Masons, and Royal Crown Derby, where the richly decorated ‘Imari’ pattern remains a favourite today.
http://collections.vam.ac.uk/item/O493643/vase/ Description and illustration on Victoria and Albert Museum website.