Is there a diamond in the quartz crystal?

No, diamonds and quartz crystals are two different types of minerals. Diamonds are made of carbon atoms arranged in a specific crystal structure, while quartz crystals are made of silicon and oxygen atoms arranged in a different crystal structure. Diamonds are much harder than quartz crystals and have different physical properties.

It is possible, but not common, to find a diamond inside a quartz crystal. Diamonds have a high hardness and can crystallize inside of quartz if the conditions are right. However, the chances of finding a diamond in a quartz crystal are very low.