Natural etching structure on a crystal face of diamond (trigons), polarised light
Natural etching structure on a crystal face of diamond (trigons), polarised light
Twin-crystal of chrysoberyl
Twin-crystal of chrysoberyl
Two-phase inclusions in tourmaline from Namibia
Two-phase inclusions in tourmaline from Namibia
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Colour zoning in ruby from Mong-Shu, Burma
Colour zoning in ruby from Mong-Shu, Burma
Stress fissure («sun spangle») in baltic amber
Stress fissure («sun spangle») in baltic amber
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Inclusions of hematite in feldspar (sunstone), India
Inclusions of hematite in feldspar (sunstone), India
Two-phase inclusion in amethyst, Brazil
Two-phase inclusion in amethyst, Brazil
Dumortierite in rock crystal, Brazil, polarised light
Dumortierite in rock crystal, Brazil, polarised light