Looks like pottery with a special glaze called majolica.

Faience, tin-glazed. Fine painted on opaque white tin glaze. Luneville-saint-clement

Majolica Palissy ware wall-plate, coloured lead glazes, Elias, Portugal

Tin-glazed. Fine painted on opaque white tin glaze in imitation of Italian maiolica. Minton Majolica Victoria plate.

Victorian Majolica jardiniere by Minton & Co. circa 1870. Coloured lead glazes.
Majolica is a word for painted[1] pottery, whose use is not always precise, and can be confusing. Note the different spellings ("i" and "j"), often confused [2], which can have different meanings, as follows.

Maiolica: Tin-glazed earthenware having an opaque white ceramic glaze with painted in-glaze decoration of metal oxide enamel colour(s). It is frequently prone to flaking and somewhat delicate[3], and reached Italy by the mid-15th century[4]. Renaissance Italian maiolica became a celebrated art form, and in contemporary English "maiolica" (with an "i") tends to be restricted to this. Maiolica developed also as faience[5] (in France and various countries), and as delftware (in UK and Netherlands). In Mediterranean countries such as Italy, Spain and Portugal, local wares continue to be called 'majolica' or 'maiolica'.