- 1). Look for seams. Glass that has been pressed in a mold often has easily visible seams, whereas any seams from the molding process of cut glass would be smoothed out before cutting in the design.
- 2). Hold the piece of glass up to the light. If it refracts light the same way a prism does --- showing a rainbow --- then it is cut glass.
- 3). Run your fingers along the designs on the glass. If the edges feel sharp, the piece is probably cut glass. The patterns in pressed glass are rounded and smooth to touch.
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