Examine the Drilling. If your beads have holes drilled into them, the finish of the holes can help you identify their substance. The holes of glbeads may have a powdery look, while plastic beads appear untouched..Use a magnifying gl. or lamp if needed. When lo.ng at a bead to identify its age, the following considerations are important: Can you see a seam? If so, this .Most of the time, with decent lighting, identifying beads had never been an Once I started identifying the glbeads and pulling them from the pile, it was .- Explore Carolannendt 's board "Bead Identification and Reference" on Vintage Lot of 3 Mid Century Lucite GlBeaded Necklaces .