Purple diamond and method of producing the same.

摘要

A purple diamond characterized in that the absorption coefficient of the Ib type nitrogen at 500 nm is 0.2 - 2 cm<-><1>, the absorption coefficient of the N-V center at an absorption peak of 570 nm is 0.3 - 10 cm<-><1>, and the absorption coefficients of the GR1 center, H2 center, H3 center and H4 center are less than 0.2 cm<-><1> in the visible region. A method of producing a purple diamond characterized by using an Ib type artificial synthetic diamond crystal wherein the Ib type nitrogen content in the crystal is within the range of 8 x 10<1><7> - 1.4 x 10<1><9> atoms/cm<3>, subjecting the diamonds crystal to an electron beam irradiation by 5 x 10<1><6> - 2 x 10<1><8> electrons/cm<2> at 2 - 4 MeV, and annealing it in a vacuum of less than 10<-><2> Torr at a temperature of 800 - 1100 DEG C for more than 25 hours.