Caucaso, Osservatorio Balcani e. "A Macedonian Ruby". OBC Transeuropa (in Italian). Archived from the original on 21 March 2024. Retrieved 21 March 2024.
Smith, Henry G. (1896). "Chapter 2, Sapphires, Rubies". Gems and Precious Stones. Charles Potter Government Printer, Australia. Archived from the original on September 29, 2007.
"Lead Glass-Filled Rubies". GIA Global Dispatch. Gemological Institute of America. February 16, 2012. Archived from the original on June 14, 2012. Retrieved January 22, 2020.
Caucaso, Osservatorio Balcani e. "A Macedonian Ruby". OBC Transeuropa (in Italian). Archived from the original on 21 March 2024. Retrieved 21 March 2024.
"Lead Glass-Filled Rubies". GIA Global Dispatch. Gemological Institute of America. February 16, 2012. Archived from the original on June 14, 2012. Retrieved January 22, 2020.
Smith, Henry G. (1896). "Chapter 2, Sapphires, Rubies". Gems and Precious Stones. Charles Potter Government Printer, Australia. Archived from the original on September 29, 2007.