Inclusions of gilalite aggregates in rock crystal from Brazil
Bubbles and swirls in moldavite (natural glass)
Dumortierite in rock crystal, Brazil, polarised light
Natural etching structure on a crystal face of diamond (trigons), polarised light
Agate from Reichweiler, Germany
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania


Swiss Gemmological Society
Secretary: Willy Bieri

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