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Schweizerische Gemmologische Gesellschaft
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Epigenetic inclusion (probanly melanterite) in quartz, Brazil, crossed polarisers
Inclusions of hematite in feldspar (sunstone), India
Inclusions of chrysotile fibres in demantoide garnet from Ural Mountains, Russia
Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil
Inclusions of hematite in aquamarine, Tanzania
Fire opal, Mexico
Spinel crystal in dolomite marble, Burma
Colour zoning in ruby from Mong-Shu, Burma

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  • Gemmology
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© SGG/SSG 2021

 

Our sponsors for 2021:

 
 
 
 
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