Natural etching structure on a crystal face of diamond (trigons), polarised light
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of hematite in feldspar (sunstone), India
Inclusions of hematite in feldspar (sunstone), India
Partially etched diamond crystal
Partially etched diamond crystal
Inclusions of gilalite aggregates in rock crystal from Brazil
Inclusions of gilalite aggregates in rock crystal from Brazil
Two-phase inclusions in sapphire, Sri Lanka
Two-phase inclusions in sapphire, Sri Lanka
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Agate from Reichweiler, Germany
Agate from Reichweiler, Germany
«Red fox agate» from Patagonia, Argentina
«Red fox agate» from Patagonia, Argentina
 
 

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Schweizerische Gemmologische Gesellschaft
Sekretariat: Antoinette Starkey
T. +41 22 735 22 66
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