Singbamroong, Sutas, Phisit Limtrakun, and Thawatchai Somjaineuk. “Beryllium Heat-Treated Blue Sapphire”. Trends in Sciences 22, no. 1 (November 10, 2024): 8405. Accessed April 8, 2026. https://tis.wu.ac.th/index.php/tis/article/view/8405.