Four Treasures Reference Database
Record No. 435
The Yogo sapphire
Book Section
Baron, A.A. (1982) The Yogo sapphire. In: International Gemological Symposium Proceedings 1982, Santa Monica, CA: Gemological Institute of America, pp. 341–347.
Sinkankas/Born No.: NIS/NIB | RWHL
corundum, USA.12, Montana.12, gems