Mature Period (1878-1890)
In the early 1880's Cézanne took his family and left Paris to return to his roots in Provence. It is here that Cézanne pushed his own unique style without the pressures of the Parisian art community. It is during this time that he began to advance his own ideas of structuralism in painting. This involved viewing pictorial elements not in their natural organic shapes, but rather in their geometric structural forms. He applied these principles to all of his painting, and not just the landscapes.
During this period, Cézanne succeeded in getting several pieces in the Salon as well as exhibiting in with the more progressive impressionists. Always viewed as somewhat an eccentric by his fellow Parisian artists, their opinion of the artist grew with his departure to the country.
Final Period (1891-1906)
In this final period, his work fully embraced the new structuralism of his art. The fresh vanguard of artists such as Picasso and Braque saw new possibilities from Cézanne's work, and the seeds of cubism and expressionism were planted.
Although never fully embraced by the public, his paintings were actively sought by savvy collectors and dealers.
Any painting bearing Cezanne's signature are highly valued -- even the early pieces from the dark period. Unlike many of his historic contemporaries, Cézanne painted all subject matter of work: landscapes, still lifes, portraits, nudes and genre pieces. No single genre has been singled out by collectors.
Recently (May, 2013), his still life. Les Pommes sold at auction for over $40 million dollars, and in 2012 The Card Players sold for $250 million, although many critics thought the painting the weakest of that series.
Generally, work from the later periods are the most highly valued pieces. And those pieces which appear most "post-impressionistic" are the ones that have greatest appeal. Oil paintings command the highest prices. Oils rarely sell for under $1 million, and certainly not any significant work
Cézanne's watercolors are also highly desired, but like most artists do not fetch the same prices as the oils. Nevertheless, a watercolor sketch for the Card Players sold for almost $20 million in 2012. However, most watercolors sell for under a $million, and occasionally they can be found for under $100 thousand.
Pencil drawings sell in the $50-100 thousand range. Even lithographs may sell upward of $30 thousand. Etchings are a relative bargain with most selling for under $1000.