The value of an antique Mason jar is dictated by three things: rarity, condition and whether it is collectible. Each individual jar can fetch a different price, and prices can range from $1 to $4,000. These considerations, along with age, completeness and size, dictate the value of antique jars.
Other factors that can influence the value of an old Mason jar include color and the embossing on the jar. The most valuable and most highly sought after colors are cobalt blue, green, amber and milk glass. Collectors can use the embossing to date the jar accurately by consulting online logo charts.