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Gemstone Science
Fracture Filling and the Problem of the Represe...
Why fracture-filled diamonds challenge gemological analysis: fillers occupy narrow voids, instruments sample limited volumes, and single observations cannot settle treatment questions.
Fracture Filling and the Problem of the Represe...
Why fracture-filled diamonds challenge gemological analysis: fillers occupy narrow voids, instruments sample limited volumes, and single observations cannot settle treatment questions.
Measuring a Diamond's Density: What Specific Gr...
Diamond's specific gravity of about 3.52 is a useful screening clue, not an identification. Learn why density depends on structure, how hydrostatic weighing works, and its limits for diamond testing.
Measuring a Diamond's Density: What Specific Gr...
Diamond's specific gravity of about 3.52 is a useful screening clue, not an identification. Learn why density depends on structure, how hydrostatic weighing works, and its limits for diamond testing.
Interpreting Diffusion-Treated Sapphire: What a...
Why a single trace-element or surface measurement cannot prove sapphire diffusion treatment. A rigorous look at detection evidence, spatial analysis, microscopy, spectroscopy, and the limits of gemological inference.
Interpreting Diffusion-Treated Sapphire: What a...
Why a single trace-element or surface measurement cannot prove sapphire diffusion treatment. A rigorous look at detection evidence, spatial analysis, microscopy, spectroscopy, and the limits of gemological inference.
Phase Change in Synthetic Alexandrite: What Str...
How polymorphic phase transformations in synthetic alexandrite affect chromium absorption and structural history, and what emerging spatially resolved analytical methods can and cannot establish.
Phase Change in Synthetic Alexandrite: What Str...
How polymorphic phase transformations in synthetic alexandrite affect chromium absorption and structural history, and what emerging spatially resolved analytical methods can and cannot establish.
Painite and the Problem of Sampling a Heterogen...
Why painite's crystal structure permits compositional variation, how growth zoning and inclusions complicate bulk analysis, and what small specimen populations mean for interpreting its physical properties.
Painite and the Problem of Sampling a Heterogen...
Why painite's crystal structure permits compositional variation, how growth zoning and inclusions complicate bulk analysis, and what small specimen populations mean for interpreting its physical properties.
Reading Kashmir Sapphire in the Host Rock: What...
How Kashmir sapphire's velvety appearance relates to corundum host rocks, trace-element colour, and light scattering, and why a visual impression cannot prove a deposit origin.
Reading Kashmir Sapphire in the Host Rock: What...
How Kashmir sapphire's velvety appearance relates to corundum host rocks, trace-element colour, and light scattering, and why a visual impression cannot prove a deposit origin.