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Gemstone Encyclopedia
How Cutting Reveals or Conceals Prehnite’s Colo...
Learn how prehnite’s growth-related color zoning interacts with cut shape, orientation, and light paths, and why a faceted stone may look uniform or visibly banded.
How Cutting Reveals or Conceals Prehnite’s Colo...
Learn how prehnite’s growth-related color zoning interacts with cut shape, orientation, and light paths, and why a faceted stone may look uniform or visibly banded.
Fluorescence, Phosphorescence, and Lab-Grown Fe...
Rainbow moonstone glows because of adularescence, not fluorescence. Learn why phosphorescence is not characteristic of this feldspar and why luminescence testing has limited diagnostic value.
Fluorescence, Phosphorescence, and Lab-Grown Fe...
Rainbow moonstone glows because of adularescence, not fluorescence. Learn why phosphorescence is not characteristic of this feldspar and why luminescence testing has limited diagnostic value.
Why Boulder Opal Shifts Color Differently from ...
Boulder opal color variation explained through silica-sphere interference, seam thickness, host ironstone, and viewing angle, with clear distinctions from black opal and assembled stones.
Why Boulder Opal Shifts Color Differently from ...
Boulder opal color variation explained through silica-sphere interference, seam thickness, host ironstone, and viewing angle, with clear distinctions from black opal and assembled stones.
Spessartine Garnet and the Geological Limits of...
Why spessartine garnet requires manganese-rich geological conditions, how its cubic structure affects optical properties, and what distinguishes it from other garnets.
Spessartine Garnet and the Geological Limits of...
Why spessartine garnet requires manganese-rich geological conditions, how its cubic structure affects optical properties, and what distinguishes it from other garnets.
How Ceylon Sapphire Gets Its Color Zoning: Grow...
Why Ceylon sapphire shows uneven color distribution: learn how growth zoning and pleochroism differ, how cutting orientation affects appearance, and why zoning is not proof of origin or treatment.
How Ceylon Sapphire Gets Its Color Zoning: Grow...
Why Ceylon sapphire shows uneven color distribution: learn how growth zoning and pleochroism differ, how cutting orientation affects appearance, and why zoning is not proof of origin or treatment.
Dioptase: A Mineral Species Without Gem Varieties
Dioptase is a distinct copper silicate mineral species with no gem variety names. Learn why its green is intrinsic, how it forms, and how it differs from lookalikes.
Dioptase: A Mineral Species Without Gem Varieties
Dioptase is a distinct copper silicate mineral species with no gem variety names. Learn why its green is intrinsic, how it forms, and how it differs from lookalikes.