Furniture is a highly collectable decorative art, and can bring a tremendous return. The most valuable items have had their authenticity verified and have minimal damage. Older furniture should have a build-up of patina, and the original finish should not have been removed. The craftspeople who produced the furniture are important to its value, with the most influential furniture makers realizing the greatest demand. Keep any documentation safe, as this adds to value. If the furniture is part of a set, complete sets are worth more than the combined value of individual pieces.