These round stones have a mysterious origin. Some people believe that they are the result of a meteor crash similar to moldavite. Others believe that it is an ancient obsidian orb that was inside boulders that have worn away over thousands of years.
Either way, this stone is extraordinarily high vibrational. The feeling is similar to moldavite. Most are round and look dark until they're lit up by a light behind it. Then the luminous glow is fascinating!
These were found in Colombia. Each is slightly different. Your stone will be unique.