Native cut stones are cut where they are found or at least in general region where they were found. Native cuts are typically not exacting in thier facets or sizes, they can be larger on the bottom or pavillion than they would be if they were cut to precision standards. Most colored stones you have ever seen are likely native cuts. The sizing can also be variable so please be careful to pay attention to the noted measurements and weights. 
All images are taken under magnification and specific lighting, you may see things in the videos that you will never see with the naked eye.  Please be aware these are ALL natural stones unless noted as synthetic also mother nature works in a dirty kitchen, inclusions are a natural part of most colored stones and part of their unique beauty and character.