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Gemstone Science
When Two Labs Disagree on a Dumortierite Crysta...
Dumortierite's fibrous, composite structure complicates synthetic identification. Learn why spectroscopy and elemental analysis can yield conflicting lab conclusions about origin.
When Two Labs Disagree on a Dumortierite Crysta...
Dumortierite's fibrous, composite structure complicates synthetic identification. Learn why spectroscopy and elemental analysis can yield conflicting lab conclusions about origin.
What a Scratch Test Cannot Tell You About Tourm...
Why Mohs hardness is not a durability summary for tourmaline. The distinction between hardness, toughness, and cleavage, and the limits of a single scratch test.
What a Scratch Test Cannot Tell You About Tourm...
Why Mohs hardness is not a durability summary for tourmaline. The distinction between hardness, toughness, and cleavage, and the limits of a single scratch test.
Why Malachite Rarely Glows: Fluorescence, Phosp...
Copper carbonate hydroxide is strongly colored but typically non-fluorescent under UV. Learn why malachite's Cu(II) lattice quenches emission and how luminescence testing fits into identification.
Why Malachite Rarely Glows: Fluorescence, Phosp...
Copper carbonate hydroxide is strongly colored but typically non-fluorescent under UV. Learn why malachite's Cu(II) lattice quenches emission and how luminescence testing fits into identification.
When Heat Does Nothing Visible: Interpreting Rh...
Rhodonite's pink color is carried by essential manganese rather than a trace chromophore, which limits heat treatment options. This article explains the step-by-step reasoning and analytical limits behind that conclusion.
When Heat Does Nothing Visible: Interpreting Rh...
Rhodonite's pink color is carried by essential manganese rather than a trace chromophore, which limits heat treatment options. This article explains the step-by-step reasoning and analytical limits behind that conclusion.
Ametrine and the Limits of Specific Gravity: Wh...
Ametrine density is consistent with quartz but cannot prove natural origin, treatment, or the cause of its purple-yellow zoning. Learn what specific gravity measures and where laboratory evidence must take...
Ametrine and the Limits of Specific Gravity: Wh...
Ametrine density is consistent with quartz but cannot prove natural origin, treatment, or the cause of its purple-yellow zoning. Learn what specific gravity measures and where laboratory evidence must take...
Why Calcite Can Mimic So Many Gem Materials: A ...
Calcite's anisotropic crystal structure causes strong double refraction and perfect cleavage. Learn why these properties create visual mimicry and how gemologists distinguish calcite from similar materials.
Why Calcite Can Mimic So Many Gem Materials: A ...
Calcite's anisotropic crystal structure causes strong double refraction and perfect cleavage. Learn why these properties create visual mimicry and how gemologists distinguish calcite from similar materials.