morecarats
Shiny_Rock
- Joined
- Sep 20, 2009
- Messages
- 371
chrono said:... Also, BE diffusion has been around a very very long time, only that the process has improved greatly as time goes by ...
Corundum diffused with beryllium first appeared in the market in Thailand in 2001. Prior to that various surface diffusion treatments had been detected (diffusing blue sapphire with titanium, for example), but the use of beryllium as a coloring agent was first seen in 2001.