This can refer to many things, but in beading it usually means either naturally occuring quartz gemstones, or man-made leaded glass beads. Adding lead to glass beads makes them sparkle more; the more lead, the higher quality the bead. It also adds weight, so really light “crystal” beads are probably just glass. Man-made crystal beads come in a variety of sizes, shapes, and colors like cubes, rounds, rondelles, and specially shaped pendants of all kinds. There are many types of crystals available, but Swarovski crystals seem to be the most popular and are widely considered the highest quality.
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