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Schweizerische Gemmologische Gesellschaft
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Dendrites in agate
Partially etched diamond crystal
Stress fissure («sun spangle») in baltic amber
Inclusion of apatite in ruby from Tanzania
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Colour zoning in ruby from Mong-Shu, Burma
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Twin-crystal of chrysoberyl
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  • Gemmology
    • Knowledge
    • Diamonds
    • Terminology
    • The 4 C's
    • Precious stones
    • Colours
    • Pearls
    • Cultured pearls
    • Treatments
  • About us
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