Natural etching structure on a crystal face of diamond (trigons), polarised light
Spinel crystal in dolomite marble, Burma
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Twin-crystal of chrysoberyl
Two-phase inclusion in amethyst, Brazil
Inclusions of gilalite aggregates in rock crystal from Brazil
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Structure in a healing fissure in topaz from Brazil

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