What should I check before buying antique glass shades or replacement parts?

Check fit first. Glass shades, chimneys, and globes come in specific fitter sizes, so measure the opening of the lamp's holder and the base of the shade before buying. A shade that is close but not exact may wobble or crack from heat.

Next, inspect for chips, cracks, and repairs by running your fingers carefully around rims and holding the glass up to a light. Small chips under the fitter rim are sometimes hidden when installed, but they should still be disclosed and priced accordingly.

Finally, decide whether you need an original or an honest reproduction. Reproduction shades are widely made and are fine for lamps you plan to use, but they should not be sold as old. A knowledgeable lamp dealer can often tell you whether a shade is period-appropriate for your lamp.