Two new synthetic emeralds
Journal Article
Gübelin, E.J. (1964) Two new synthetic emeralds. Gems & Gemology, Vol. 11, No. 5, Spring, pp. 139–148.
ISBN/ISSN: 0016626X | Sinkankas/Born No.: NIS/NIB | RWHL
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Gilson, Chatham, Zerfass, Farben, gems