TY  - BOOK
AU  - Gübelin,DrE.
TI  - Diamond Grading ABC: Handbook for Diamond Grading 
SN  - 398004341X
PY  - 1986///]
CY  - Kronberg/Ts.
PB  - Verena Pagel-Theisen
KW  - Diamond Grading
KW  - Handbook
ER  -