Furniture

Crafted furniture pieces are collectible items that can sell for millions of dollars. One-of-a-kind furniture, even in the millions range, are the most expensive items in high-end antique shops. When a manufacturer no longer produces a furniture piece, the value of existing pieces increases. As time passes, some pieces will be destroyed or irreparably damaged; this raises the asking price further for a piece in good condition. But some very old pieces were crafted by hand and have no equal in the world. This furniture is practically priceless. For example, a Chippendale antique secretary by a notable family of cabinet-makers in the 18th century is worth over $12 million dollars as of 2011.

Cars

Classic cars are a category of antiques that represent an investment. Some models, such as the Peter D. Williamson Bugatti 57S Atlantic, are so rare that as of 2010 it could potentially bring a seller over $40 million dollars. A 1937 version of the Bugatti 57S sold for about $4.4 million in 2009. Ferrari manufactured a couple of much sought-after models in the 1950s and 1960s worth over $10 million in 2010. The iconic Rolls-Royce had a listing price of $13 million with its "Star of India" Rolls-Royce Phantom II Continental, but shortly after the listing appeared it was removed.

Jewelry

Antique jewelry showcasing real gems appreciates in value over time. An antique piece of jewelry constructed of clear gemstones will be appraised at a high price. But jewelry is nothing without someone to wear it, and if this wearer has notoriety the price of the jewel increases; the jewels worn by Queen Elizabeth II, for example, would be valued at a higher price than the same jewels worn by an unknown individual.

Heirlooms

Family heirlooms are anything of value that is passed on from one generation to the next. These could be furniture pieces, jewelry or even an old blanket. As the generations pass, the origin of the pieces may be lost, but their value could grow significantly. For example, in 2009 a collection of jade bowls and a jade statue brought to PBS' "Antiques Road Show" was valued at $710,000 to just over $1 million by appraiser James Callahan.