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Schweizerische Gemmologische Gesellschaft
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Fluid inclusions in quartz with bituminous daughter minerals, China
Fire opal, Mexico
Natural etching structure on a crystal face of diamond (trigons), polarised light
Inclusions of hematite in aquamarine, Tanzania
Dendrites in agate
Inclusions of fossil plant debris in opal from Wollo, Ethiopia
Agate from Anzi, Maroc
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers

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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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