This ring was made and worn right after the American Revolution had been fought. Back in England (where our ring was) the industrial revolution was churning and the British empire was expanding. Several decades earlier in the 1700s, diamonds had been discovered in Brazil. Before that, they had only been found in India; our stone may have come from either place. It's a table cut, one of the simplest modifications that can be made to a diamond. The naturally occurring octahedron shape has it's top point cut off, like a table. Early, rare, outstanding.