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Gemstone Encyclopedia
Fire Agate and the Question of Crystal Structur...
Fire agate is a layered chalcedony aggregate with iron-bearing bands. Learn how its structure produces iridescence and why no synthetic equivalent is grown in laboratories.
Fire Agate and the Question of Crystal Structur...
Fire agate is a layered chalcedony aggregate with iron-bearing bands. Learn how its structure produces iridescence and why no synthetic equivalent is grown in laboratories.
How Cutting Choices Change Spessartine Garnet's...
How cutting choices affect spessartine garnet color, saturation, and light return, and why its singly refractive nature limits optical effects and helps separate it from lookalikes.
How Cutting Choices Change Spessartine Garnet's...
How cutting choices affect spessartine garnet color, saturation, and light return, and why its singly refractive nature limits optical effects and helps separate it from lookalikes.
Why Gem-Quality Chrome Diopside Is Geologically...
Chrome diopside is a chromium-bearing variety of diopside. Learn why the mineral is common but gem-quality crystals are rare, and how formation conditions limit supply.
Why Gem-Quality Chrome Diopside Is Geologically...
Chrome diopside is a chromium-bearing variety of diopside. Learn why the mineral is common but gem-quality crystals are rare, and how formation conditions limit supply.
Chrome Diopside: Why Cleavage and Fracture Matt...
Chrome diopside durability depends on two good cleavages at near-right angles, possible parting, and brittle fracture, not on Mohs hardness alone.
Chrome Diopside: Why Cleavage and Fracture Matt...
Chrome diopside durability depends on two good cleavages at near-right angles, possible parting, and brittle fracture, not on Mohs hardness alone.
Crystal Opal and Its Lookalikes: Reading Refrac...
Crystal opal is isotropic with no birefringence and a refractive index near 1.45. Learn how optical character and RI distinguish it from glass, quartz, beryl, and synthetic opal lookalikes.
Crystal Opal and Its Lookalikes: Reading Refrac...
Crystal opal is isotropic with no birefringence and a refractive index near 1.45. Learn how optical character and RI distinguish it from glass, quartz, beryl, and synthetic opal lookalikes.
Reading Tahitian Pearls Without Reading Their O...
Tahitian pearl appearance reflects nacre structure and pigments, not geological origin. Learn why color cannot prove natural status, treatment, or specific island source.
Reading Tahitian Pearls Without Reading Their O...
Tahitian pearl appearance reflects nacre structure and pigments, not geological origin. Learn why color cannot prove natural status, treatment, or specific island source.