From the site:
The big difference between moissanite and diamond is that moissanite can be manufactured reliably and efficiently in a laboratory.
That site is pretty old. Lab-grown gem quality diamonds are already better quality and up to 80% cheaper than almost all natural diamonds. They are being produced in volume by High Pressure High Temperature (HPHT) and Chemical Vapour Deposition (CVD) processes and the best are IGI and GIA certified.
One downside of moissanite is that it has double refraction (a bit like calcite) which can make the reflections and refraction look a little fuzzy when compared to diamond or even cubic zirconia.
At the end of the day, its a shiny stone.
