Instructions
Look for a good color. Mary Gregory comes in a variety of colors; some colors demand higher prices. The general order of value is cranberry, amethyst, blue, light blue, light green, emerald, amber and clear, with clear being the least desirable.
Examine the children. Mary Gregory is known for the delightful depiction of Victorian children. Most desirable are items that have active children; these children may be chasing a butterfly, rolling a hoop or carrying sports equipment, like a tennis racket. Multiple children are also deemed more valuable.
Evaluate the condition. The enamel should be white; any other color may lower the desirability. The enamel should also be thick enough not to be transparent. The piece should have not cracks, chips or obvious flaws. The glass should not be cloudy.
Observe the size and shape. Larger pieces are often more valuable, such as pitchers and vases. Older pieces will be lighter weight because of their mouth blown construction.
Determine the age. Older pieces are more prized. Mary Gregory glass has been made since about 1879 to present day. The older glass, roughly from 1879 to 1939, was blown by mouth and considered a better quality of glass. Older pieces should have fine detail on the enamel, and the children's faces should be delicate and pretty.
Buy from a reputable dealer. Since Mary Gregory has been in production for so long, many "fakes" and poor quality pieces are available. A reputable glass dealer can assist in finding a beautiful piece.