Diamond Education
For 1,000 years, starting in roughly the 4th century BC, India was the only source of diamonds. They are the hardest gemstone on earth, and rated as a top on the MOHS scale. For the refractive index (velocity in free space / velocity in the material), diamonds are rated 2.42 which affects how light is able to pass through and reflect into the material. There is very little loss in energy when light passes through a diamond. Double refraction : Light goes through the table and bounces, enabling you to see all of the gemstone.