The ring shown is a titanium ring machined to a square shape with an inlay of genuine Gibeon Meteorite that wraps all the way around the ring.  The meteorite was discovered in Namibia in South Africa in 1838.  It has a unique crystalline grain structure called Widmanstatten lines that were caused by the meteorite slowly cooling over millions of years as it hurtled through space.  It is estimated to be over 4 billion years old!  The government of Namibia has stopped export of the meteorite, so it will become more rare as the years go by.  The ring shown has a Polished finish on the outside and is 7mm wide.