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Gemstone Science
When Citrine Glows: What Luminescence Screening...
Why citrine's fluorescence and phosphorescence are informative screening signals but cannot alone prove natural origin, irradiation treatment, or heat treatment in quartz gem material.
When Citrine Glows: What Luminescence Screening...
Why citrine's fluorescence and phosphorescence are informative screening signals but cannot alone prove natural origin, irradiation treatment, or heat treatment in quartz gem material.
Red Beryl and the Problem of Hydration: When th...
Why red beryl stones with the same composition can behave differently: channel water, fluid inclusions, microporosity, and the analytical limits of infrared and Raman methods.
Red Beryl and the Problem of Hydration: When th...
Why red beryl stones with the same composition can behave differently: channel water, fluid inclusions, microporosity, and the analytical limits of infrared and Raman methods.
Enstatite Luminescence and the Evidence Problem...
A rigorous look at fluorescence and phosphorescence in gem enstatite, why iron quenching and excitation conditions limit interpretation, and how gemologists should weigh luminescence against other evidence.
Enstatite Luminescence and the Evidence Problem...
A rigorous look at fluorescence and phosphorescence in gem enstatite, why iron quenching and excitation conditions limit interpretation, and how gemologists should weigh luminescence against other evidence.
Tektite Optics Without a Lattice: Why Natural G...
Why tektites can look bright despite modest refractive index, and how natural impact glass differs optically and analytically from laboratory-grown glass.
Tektite Optics Without a Lattice: Why Natural G...
Why tektites can look bright despite modest refractive index, and how natural impact glass differs optically and analytically from laboratory-grown glass.
When Crystal Growth Logic Meets Amber, Copal, a...
Why crystal-growth reasoning transfers only partially to amber, copal, and jet, and how molecular maturation, compaction, spectroscopy, and microscopy define their characterization limits.
When Crystal Growth Logic Meets Amber, Copal, a...
Why crystal-growth reasoning transfers only partially to amber, copal, and jet, and how molecular maturation, compaction, spectroscopy, and microscopy define their characterization limits.
Reading Danburite's Rough: What the Stone's Fra...
Danburite's cleavage and conchoidal fracture control how much gem material survives extraction and sorting. A structural look at recovery losses and their interpretive limits.
Reading Danburite's Rough: What the Stone's Fra...
Danburite's cleavage and conchoidal fracture control how much gem material survives extraction and sorting. A structural look at recovery losses and their interpretive limits.