When Tiffany Style Diamonds is cut too deep light leaks out the bottom, brilliance is lost, and the ideal cut will appear to be dark.
Up to the fourth century, diamond engagement ring were known only in their rough, or crystalline forms. They came in a variety of shapes, the most common being the octahedron. This was a crystal with eight faces, resembling two pyramids joined at their bases.
Most gold engagement ring were formed more than 100 miles below the surface of the Earth, some from perhaps 400 miles down.