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Schweizerische Gemmologische Gesellschaft
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Fire opal, Mexico
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Inclusions of rock crystal and rutile needles in quartz, Brazil, polarised light
Colour zoning in ruby from Mong-Shu, Burma
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Partially etched diamond crystal
Agate from Anzi, Maroc
Two-phase inclusion in amethyst, Brazil

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  • Gemmology
    • Knowledge
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    • Terminology
    • The 4 C's
    • Precious stones
    • Colours
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    • Treatments
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© SGG/SSG 2020

 

Our sponsors for 2020:

 
 
 
 
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