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Home page: White gold ring set with an amazing oval cut Tanzanite of 5.45 cts, paved with 60 diamonds for 0.60 ct.  ©

Why invest in precious stones: Inclusions of chrysotile fibres in demantoid garnet from Ural mountains, Russia. Photo: Michael F. Hügi, SGG ©

Services & activities: Inclusions of hematite in feldspar (sunstone), India. Photo: Michael F. Hügi, SGG ©

Guide to stones: Inclusions of melanterite in rock crystal, from Minas Gerais, Brazil. Photo: Michael F. Hügi, SGG ©

Ruby: Mogok ruby. Photo: SSEF © / Sapphire: Rutile in sapphire. Photo: SSEF © / Emerald: Colombia emerald. Photo: SSEF © / Diamond: Diamond inclusion. Photo: SSEF ©

Expertise & authentication: Two-phase inclusions and rutile needles in rock crystal from Brazil. Photo: Michael F. Hügi, SGG ©

Sustainable projects: Inclusion of rock crystal in quartz, found in Brazil. Photo Michael Hügi, SGG ©

About: Inclusions of anatase crystal and rutile fibres in rock crystal from Brazil. Photo: Michael F. Hügi, SGG ©