While fracture filling as a method to enhance gems has been found in gems over 2,500 years old, the diamond's unique refractive index required a more advanced solution than simple wax and oil treatments. This technology became available roughly 20 years after the time the laser drilling technique was developed.
The MANCOSA MBA is an internationally recognised postgraduate academic programme and, one of the most highly recognised in Southern Africa.
US also thinks it is unfair that China and India, which are large producers of carbon dioxide, are exempted from the protocol whereas US is not. A: Some countries, including the United States, have refused to ratify the treaty.S was the largest carbon dioxide emitter in 2004. This obviously shows that they did not follow the Kyoto Protocol, thus they signed it but did not ratify it.