Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania

Dumortierite in rock crystal, Brazil, polarised light

Stress fissure («sun spangle») in baltic amber

Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia

Bubbles and swirls in moldavite (natural glass)

Fire opal, Mexico

Fluid inclusions in quartz with bituminous daughter minerals, China

Inclusions of gilalite aggregates in rock crystal from Brazil

Links

Associazione Italiana Gemmologi

Deutsche Gemmologische Gesellschaft

GRS GemResearch Swisslab AG

Federation of European Education in Gemmology

Gemological Institute of America GIA

Gemmological Association of Great Britain

Schule für Gestaltung Zürich

The World Jewellery Confederation CIBJO

Zentralverband Schweizerischer Goldschmiede und Uhrenfachgeschäfte VSGU

Gübelin Gem Lab

Gübelin Akademie

Schweizerisches Gemmologisches Institut SSEF

Goldor Magazin für Edelmetalle, Schmuck, Uhren und Edelsteine

Portal der Uhren- und Schmuckbranche

Hong Kong Jewellery & Watch Fair

Sainte-Marie aux Mines

Tucson Gem & Jewelry Show

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