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Gemstone Encyclopedia
Matrix Opal and the Limits of Refractive Index ...
Matrix opal is a composite of opal and host rock. Refractive index, birefringence, and optical character cannot be measured as single values. Learn why and what diagnostic methods work instead.
Matrix Opal and the Limits of Refractive Index ...
Matrix opal is a composite of opal and host rock. Refractive index, birefringence, and optical character cannot be measured as single values. Learn why and what diagnostic methods work instead.
Mother of Pearl: Why Some Shells Show Iridescen...
Learn why some mother of pearl shows strong iridescent flashes while other shell linings appear plain, and how nacre structure controls this optical difference.
Mother of Pearl: Why Some Shells Show Iridescen...
Learn why some mother of pearl shows strong iridescent flashes while other shell linings appear plain, and how nacre structure controls this optical difference.
Goshenite, Synthetic Beryl, and the Limits of V...
How gemologists distinguish natural goshenite from synthetic beryl and treated beryl using inclusions, trace chemistry, and optical properties rather than visual appearance alone.
Goshenite, Synthetic Beryl, and the Limits of V...
How gemologists distinguish natural goshenite from synthetic beryl and treated beryl using inclusions, trace chemistry, and optical properties rather than visual appearance alone.
Distinguishing Hessonite from Spessartine Garne...
Hessonite and spessartine garnets are often confused. Discover how specific gravity, refractive index, and inclusions provide reliable gemological identification.
Distinguishing Hessonite from Spessartine Garne...
Hessonite and spessartine garnets are often confused. Discover how specific gravity, refractive index, and inclusions provide reliable gemological identification.
Why Bloodstone Is a Quartz, Not a Jasper: Readi...
Bloodstone is often labeled a jasper, but mineralogically it is green chalcedony colored by iron oxide. Learn why the trade name differs from its true quartz identity.
Why Bloodstone Is a Quartz, Not a Jasper: Readi...
Bloodstone is often labeled a jasper, but mineralogically it is green chalcedony colored by iron oxide. Learn why the trade name differs from its true quartz identity.
Apophyllite: Mineral Species, Gem Variety, or J...
Apophyllite is a mineral group, not a single species. Learn how fluorapophyllite and hydroxyapophyllite differ in composition, physical properties, and gemological identification.
Apophyllite: Mineral Species, Gem Variety, or J...
Apophyllite is a mineral group, not a single species. Learn how fluorapophyllite and hydroxyapophyllite differ in composition, physical properties, and gemological identification.