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Gemstone Science
Kashmir Sapphire and the Problem of Optical Res...
Kashmir sapphire's blue comes from intervalence charge transfer in corundum, but synthetic sapphire and glass can look similar through different mechanisms. Learn why appearance alone cannot establish identity, treatment, or...
Kashmir Sapphire and the Problem of Optical Res...
Kashmir sapphire's blue comes from intervalence charge transfer in corundum, but synthetic sapphire and glass can look similar through different mechanisms. Learn why appearance alone cannot establish identity, treatment, or...
Why Glass-Ceramic Gemstones Do Not Color the Sa...
Glass-ceramic gem materials can look different despite sharing a name. Learn how microstructure, dopants, lattice defects, redox state, and scattering control their color and why one observation is rarely enough.
Why Glass-Ceramic Gemstones Do Not Color the Sa...
Glass-ceramic gem materials can look different despite sharing a name. Learn how microstructure, dopants, lattice defects, redox state, and scattering control their color and why one observation is rarely enough.
What Oil Actually Does Inside an Emerald Fracture
How oil treatment reduces fracture visibility in emerald through refractive-index matching, what fillers are, and how gemologists reason from observation to evidence when detecting treatment.
What Oil Actually Does Inside an Emerald Fracture
How oil treatment reduces fracture visibility in emerald through refractive-index matching, what fillers are, and how gemologists reason from observation to evidence when detecting treatment.
Jeremejevite: When Crystal Structure Outvotes C...
Why jeremejevite's hexagonal structure and compositional tolerance create overlapping optical signatures, and how gemologists reconcile structure, chemistry, and measurement uncertainty.
Jeremejevite: When Crystal Structure Outvotes C...
Why jeremejevite's hexagonal structure and compositional tolerance create overlapping optical signatures, and how gemologists reconcile structure, chemistry, and measurement uncertainty.
Chrome Diopside and the Geochemistry of Green: ...
How chromium colors chrome diopside, where the element comes from geologically, and what trace-element analysis can and cannot establish about formation and origin.
Chrome Diopside and the Geochemistry of Green: ...
How chromium colors chrome diopside, where the element comes from geologically, and what trace-element analysis can and cannot establish about formation and origin.
Reading Opal Before the Lab: What Quick Tests C...
Why quick opal tests only narrow possibilities, and how microscopy, spectroscopy, and composition evidence combine when treatment, origin, or assembly must be established.
Reading Opal Before the Lab: What Quick Tests C...
Why quick opal tests only narrow possibilities, and how microscopy, spectroscopy, and composition evidence combine when treatment, origin, or assembly must be established.