Before revision: Clockwise from left bottom: (1) Initial (2×2 mm); (2,3,4) Irradiated by different doses of 2 MeV electrons; (5,6) Irradiated by different doses and then annealed at Irradiation can be used to cross-link plastics or to improve material qualities of semi-precious stones as it is widely practised in jewelry industry and enabled the creation of gemstone colors that do not exist or are extremely rare in nature.
After revision: Clockwise from left bottom: (1) Initial (2×2 mm); (2,3,4) Irradiated by different doses of 2 MeV electrons; (5,6) Irradiated by different doses and then annealed at The irradiation process is widely practiced in jewelry industry and enabled the creation of gemstone colors that do not exist or are extremely rare in nature.