It is human nature that we tend to use the stuff that is tough, along with families, but with the guests coming over, we take out the crockery that is delicate and easy to break because it gives a better look and a good impression to the people that are visiting you. As we are aware of the fact that glass is stronger when it is compared to crystal and that is the sole reason why people usually have glass glasses used at homes and the crystal ones are only taken out when there are visitors at home. This is because the glasses that are made of glass are stronger than the glasses that are made of crystal and at home, we tend to use things roughly and as these crystal whiskey glass are expensive as well, the elders do not want us breaking them too often as well then.
People are rather confused of how to tell if a glass is made of glass or crystal, they tend to get confused in such scenarios and find it very difficult to point out a difference. While it is a valid confusion, because both the materials are clear in nature, as in both, the glass and the crystal are transparent by nature, people do not find it easy to tell if the glass is made of glass or of crystal. However, it is not a hard thing to tell, given you know the basic difference that is that whenever you get a glass, you should hold it up and against light, if the glass is made of crystal you would see a rainbow being formed but if it is glass, no rainbow would be seen at all. Another way is just tap the glass, if after you have tapped the glass you hear a ring and the sound is echoed, it means that the glass is made of crystal, if not, you can be sure that the glass is made of crystal for sure then.
For the perfect wine glasses to be made, the material of the glasses should be thin because of the tradition as the wine glasses are usually the ones that have a thin structure. The crystal is the only material that gets a perfect idea of how a wine glass should look as it gives a thin look to the wine glass when compared to the glass made of glass for that matter. If the wine glass is made of glass, then people fear that the glass can get in the way of the drink that the person is drinking against his tongue and that is why it is preferred that the wine glasses should be of crystal and not glass then.