TY  - SER
AU  - Dharmaratne, P.G.R.
TI  - Gemmological examination of a colour changing cobalt spinel
SN  - 0343-7892
PY  - 1993///]
CY  - [s.l]
PB  - [s.n]
KW  - COBALT SPINEL
KW  - GEMMOLOGY
ER  -