Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Two-phase inclusion in amethyst, Brazil
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
«Red fox agate» from Patagonia, Argentina
Dendrites in agate
Two-phase inclusions in tourmaline from Namibia


Schweizerische Gemmologische Gesellschaft
Sekretariat: Iva Pavic

c/o Iva Pavic, Heerenschürlistrasse 4, 8051 Zürich

T. +41 78 720 98 54
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