Iznik ceramics, so well known from the Ottoman Empire, came from the town of İznik (or Nicaea in Greek). The town developed earthenware pottery with underglaze decoration in the late 14th century, following the style laid out by Seljuq pottery. However, the style developed into quality fritware, with Chinese blue and white decorations under a clear lead glaze. Over time the styles became less formal and more flowing, including flowers such as chrysanthemums and tulips. Iznik pottery out of Iznik lasted to the mid 17th century but some copies are usually sold for tourists.This bottle base is an early style and dated to 1510C.E. It is 27.4cm high, a drop shape with a short foot, decorated with blue floral sprays and white lattice work. Sold by Christies for £121,250 ($185,998).This iznik jug is 24.5cm high, baluster shaped with single loop handle. Decorations are red flowers with blue saz leaves. Thought to be from 1560C.E. Sold by Christies for £30,000 ($46,020).This dish is thought to be from 1590C.E. It has a 30.9cm diametre, decorated with blue, red, green and black around a central floral medallion. It was sold by Christies for £15,000 ($23,010).This tankard is dated to 1610C.E. It is 20.2cm high, decorated with saz leaves and tulips. The handle has been restored, but this shape is very common. It was sold by Christies for £8,125 ($12,464).This iznik tile is dated to 1580 C.E. It is 25.3cm square, with decorations of a central floral medallion surrounded by scrolls of red and green, with black outline on a white background. Sold by Christies for £5,378 ($7,781). The Christies’ website has zoom function on almost all of the pictures.
Dating Ottoman Turkish Works in the Saz Style by Walter B. Denny. JStor article.
The Technology of Fifteenth Century Turkish Tiles: An Interim Statement on the Origins of the Iznik Industry by J. Henderson and J. Raby. JStor article.
From International Timurid to Ottoman: A Change of Taste in Sixteenth-Century Ceramic Tiles by Gülru Necipoğlu. JStor article.
A Group of Ottoman Pottery in the Godman Bequest by Michael Rogers. JStor article.
Ottoman Ceramics in European Contexts by Fi̇li̇z Yeni̇şehi̇rli̇oǧlu.
I would also recommend finding books on iznik pottery, as there are no books available to read through Google Books.