How to distinguish whether a bead is made from glass

Glass beads come in a kaleidoscope of colors, sizes, and shapes that will definitely earn the adoration of that loved one. Aside from gifts, glass beads have qualified as currency, works of art, or high status symbols.
How can we distinguish whether a bead is made from glass? Glass is cool to the touch when not being worn against the skin. It is fairly heavy and makes a clinking sound when knocked together or tapped on your teeth.
Glass beads date from at least 2500 B.C. There is probably a larger assortment of Wholesale Beads made of glass than of any other material. Glass allows for the huge range of colors and shapes that can be made from this extremely versatile substance. The colors in glass come from various metals and oxides that go into its making, for example: a wide variety of colors are possible with the addition of metals.
Glass beads include Bugle Beads, Crystal Beads, Fire Polish Beads, Indian Beads, Lampwork Beads, Pressed Glass Beads and Seed Beads.
Crystal glass beads are the most recognized name among the fine quality beads. These beads exceed all others in terms of quality and elegance and are extremely popular among customers from many different backgrounds and ages. Crystal Beads are made from glass with lead in it. A clean finish and crisp facets make these beads sparkle. They come in many shapes: round, bicone, drop, cube, etc. They are most often from Austria. Swarovski crystal beads are the best quality crystal beads, due to the lead content in the glass. They are measured in millimeters.
Lampwork Beads are artistic handmade beads. Hot glass is spun onto a copper wire (mandrel) over a flame (lamp) making each one unique. The bead can be further worked by adding other pieces of glass from rods called stringers, pieces of gold or silver leaf and millefiore. Lampwork Beads can be very heavy and expensive. They are therefore usually used as a focal point in a beaded jewelry piece.
Pressed Glass Beads are colorful beads made by pressing glass in molds. They are often called Czech glass. They come in a variety of shapes including leaves, flowers, hearts and fish.