if you are talking about the chemistry of the problem: a glass has no structure (amorphous state).a cristal (AKA solid state) has structure, in fact a crystal can show X-rays diffraction.
Throw them at the ground. The glass will shatter. Plastic will not. dont try this at home... It wont hold water.
Most of the time it will. Good crystal always will. You can tell crystal from glass by lightly tapping the side of the glass, vase, or item. When you do this you will get a ringing sound from crystal and a "thump" sound from glass.
Crystal Glass mine (not on most islands, Glass Blower to improve this, Trade or Pillage.
Crystal and glass are the same thing. Crystal is glass that contains lead. When lightly tapped it has a sharp ring compared to plain glass.
Crystal glass contain lead.
Diamond is a crystal. Yes.
With so many fake waterford items made, identifying genuine waterford lamps can be difficult. Look for a gold sticker with green seahorse emblem on the bottom, or look for "waterford" etched into the bottom. To tell the difference between a glass fake and a crystal genuine, check for thickness, light, cut, and weight. Crystal is thicker than glass, crystal is clear while glass has a slight yellow or green tint, glass has rougher edges while crystal has a more smooth cut, and crystal is heavier than glass.
Diamond is a crystal. Yes.
To test crystal glassware for authenticity you can weigh it as crystal is heavier than glass. In addition crystal sparkles in light while glass doesn't.
Crystal vases have thicker walls than those of glass vases. These thicker walls give an advantage over glass vases for breakage. Glass vases are also harder to clean than crystal vases, as spots will often show up more on glass vases than on crystal vases.
A glass pearl has a round glass bead under the pearl coating. A Swarovski pearl has a round Swarovski crystal bead under the pearl coating.
Fine crystal is considered high quality glass. In order for the product to be classified as crystal rather than glass, at least 10% lead oxide has to be present.