Instructions
Consider the color. While graniteware was produced in a wide variety of colors -- blue, gray, white, green, brown, cream, lavender, yellow and black -- the higher cost of manufacturing red items meant fewer were produced. Red is now one of the most highly sought-after colors.
Identify the pattern. Graniteware patterns include swirled, spattered, speckled, mottled, checkered and shaded. Some patterns were given more ornate names such as "Snow on the Mountain" or "Chicken Wire." The "End of the Day" pattern, arguably the most sought-after pattern, includes random arrangements of any enamel color that was literally left over at the end of the work day. The National Graniteware Society offers collector guides that aid in identifying a pattern.
Rate the overall condition. Graniteware collectors have a system of ranking the condition of each piece. An item is considered in mint condition if it has no chips and high shine, near mint if it contains only a limited amount of chipping, and good plus if it has chipping and a hole only as small as a pinhole in the bottom. The Kovels Price Guide can offer collectors a general sense of the value of patterns and the impact of condition on a piece.
Figure the relative age of the piece. Older items -- which are more valuable -- are often riveted, and include wooden handles and knobs. Older pieces are also heavier than newer reproductions.
Rank the rarity. Items originally produced in small numbers -- such as salesman samples or advertising pieces -- are now the most difficult to find.
Consider the market. One of the most important factors in determining the value of an antique is interest. If graniteware is a relatively "cool" or somewhat unpopular collectible in your area, local antique dealers will likely give you a lower appraised value, even if your item is of high quality and relative rarity. To get the most money out of your graniteware, consider selling online or holding onto the piece until interest piques again.