Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusion of apatite in ruby from Tanzania
Two-phase inclusions in sapphire, Sri Lanka
Midge included in amber from the Baltic coast, polarised light
Colour zoning in ruby from Mong-Shu, Burma
Spinel crystal in dolomite marble, Burma
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

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