METHOD OF COLORING INSERTIONS OF OXIDE CRYSTAL-BASED JEWELER'S STONES Russian patent published in 1997 - IPC

FIELD: gem treatment. SUBSTANCE: invention relates to technology of fine treatment of natural and synthetic jeweler's stones with special emphasis on coloring colorless oxide material- based gem insertions. Aim is achieved by annealing of insertions in specially constructed corundum articles in inert gas atmosphere at 1400-1600 C for 2-6 h. "Color play" effect and coloration intensity are attained by choosing appropriate shape of corundum article, by locating stone to be colored in the latter, and by mechanically adjusting thickness of colored layer. EFFECT: facilitated procedure control. 3 cl, 4 dwg