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Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps. It is also used in the flint (actually ferrocerium) of lighters.
The examples above shows the Lead Glass Filled Ruby or Composite Ruby. By looking through the loupe, with the ruby in front of a light, you can see the bubbles that are in the glass. This is created in the glass as it cools. Another thing to look for in the reflected light are lots of intersecting lines looking something like a spider web or a fingerprint where the glass is holding things together.