Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Two-phase inclusions in tourmaline from Namibia
Structure in a healing fissure in topaz from Brazil
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Two-phase inclusion in amethyst, Brazil
Inclusions of hematite in feldspar (sunstone), India
Inclusion of apatite in ruby from Tanzania

Contact

Swiss Gemmological Society
Secretary: Willy Bieri

c/o Willy Bieri, Feldgass 34, 6170 Schüpfheim

T. +41 78 696 19 81
E. nfgmmlgch