Firstly we have to decide upon the type of crystals that we are looking to make. This highly depends upon the purpose that the product has to serve.
Image Courtesy: tqn.com
After the decision on the matter, we have to check out that what sorts of crystals are required to serve the purpose. Crystals can be made from several chemicals and that depends upon the parent molecules and atoms that are used in the process. The resulting crystal will have the properties similar to those of the parent atom.
Now we have to prepare a saturated solution. A more dilute solution will tend to evaporate with time as the air aids in evaporating the solution and after sometime, this dilute solution, with the loss of liquid via evaporation, will turn into a saturated solution. However, this process is time consuming and evaporation may take many days or even weeks to complete.
After this, we have to create a crystal garden. This is also called a geode. In this process, the saturated solution is poured over a substrate and the setup is covered with a towel. With the passage of time, crystals form from the solution after evaporation takes place.
Finally a seed crystal can be made and grown. This is required if you want to form crystals in larger size. In this you have to pour the solution in a very smooth container like a glass jar and dangle a rough object into the liquid. This forms small crystals and these can be used as seed crystals.