gem jewelry gemstone crystals luminosity color transparency ornaments

From a geological point of view it has a broader meaning:
Gems are minerals or crystals that draw people’s attention to good color or light phenomena such as luminosity.
From the gemology point of view, the following can be mentioned as properties of gemstone stones:
* Good color

* Hardness above 6

* Being scarce

* Transparency

* Color glitter

It should be noted, however, that these properties are not generally absolute and, for example, the absolute value of transparency cannot be stated on the basis of which the mineral is called a gem.
The use of different minerals as jewelery and ornaments depends heavily on different people’s cultures, beliefs and traditions.