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Schweizerische Gemmologische Gesellschaft
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Two-Phase inclusions and rutile needles in rock crystal from Brazil
Structure in a healing fissure in topaz from Brazil
Two-phase inclusions in sapphire, Sri Lanka
Twin-crystal of chrysoberyl
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Stress fissure («sun spangle») in baltic amber
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Inclusions of hematite in aquamarine, Tanzania

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Schule für Gestaltung Zürich
 
 
The World Jewellery Confederation CIBJO
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Gübelin Gem Lab
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Goldor Magazin für Edelmetalle, Schmuck, Uhren und Edelsteine
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