Various Categories of Ruby Inclusions.
1. Solid Ruby Inclusions.
Solid Inclusions in Crystals and/or glasses formed before the gem was trapped by the growing gemstone. The crystals may appear either as heavily etched or corroded which formed long before the host or as well-formed before the ruby crystals which developed just prior to the host are spinel in ruby.
2. Contemporary (Syngenetic) Ruby Inclusions.
Contemporary (Syngenetic) ruby inclusions that have formed at the same time as the host. Since almost all genuine ruby stones have some inclusions or at least small flaws in them it is a good indicator if it is a natural Myanmar ruby or from the lab.
Inclusions naturally always affect the price along with other factors such as the depth of the color, the cut and the carat size of the mineral. Many times other stones like red spinel, red tourmaline and red garnet are used instead, since they look very similar to a untrained eye.
3. Epigenetic Ruby Inclusion.
It needs a thorough gemological check of any jewelry where the red stones are used before you purchase it, since all other precious stones of red color are worth much less than a genuine one.