Stress fissure («sun spangle») in baltic amber
Two-phase inclusion in amethyst, Brazil
Inclusions of gilalite aggregates in rock crystal from Brazil
Inclusion of apatite in ruby from Tanzania
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Inclusions of hematite in feldspar (sunstone), India
Inclusions of fossil plant debris in opal from Wollo, Ethiopia

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