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Gemstone Encyclopedia
Why Synthetic Red Beryl Can Appear in the Same ...
How synthetic red beryl relates to natural red beryl, why the trade name can be ambiguous, and what gemological testing can and cannot establish about origin.
Why Synthetic Red Beryl Can Appear in the Same ...
How synthetic red beryl relates to natural red beryl, why the trade name can be ambiguous, and what gemological testing can and cannot establish about origin.
Sugilite's Color Direction: Why One Stone Can L...
Why sugilite shows violet, pink, and brownish colors in different crystal directions, and why the opaque purple aggregate people call sugilite does not show this effect at all.
Sugilite's Color Direction: Why One Stone Can L...
Why sugilite shows violet, pink, and brownish colors in different crystal directions, and why the opaque purple aggregate people call sugilite does not show this effect at all.
Why Unakite Cannot Be Identified by Refractive ...
Unakite is a rock of epidote, orthoclase feldspar, and quartz. Learn why its refractive index and birefringence readings are inconsistent and how enhancement affects identification.
Why Unakite Cannot Be Identified by Refractive ...
Unakite is a rock of epidote, orthoclase feldspar, and quartz. Learn why its refractive index and birefringence readings are inconsistent and how enhancement affects identification.
When Scapolite Crystals Look Like Something Els...
Scapolite is a marialite-meionite series, not one species. Learn how its tetragonal habit, composition, and informal trade names affect gem identification.
When Scapolite Crystals Look Like Something Els...
Scapolite is a marialite-meionite series, not one species. Learn how its tetragonal habit, composition, and informal trade names affect gem identification.
Petalite and Cutting Orientation: Why Direction...
Why cutting orientation matters in petalite: cleavage directions, monoclinic structure, refractive index, and the limits of orientation in a soft, cleavable lithium aluminum silicate gem material.
Petalite and Cutting Orientation: Why Direction...
Why cutting orientation matters in petalite: cleavage directions, monoclinic structure, refractive index, and the limits of orientation in a soft, cleavable lithium aluminum silicate gem material.
Why Some Mozambique Ruby Crystals Are Transpare...
Mozambique ruby transparency depends on internal inclusions, fractures, and growth zoning. Learn why some crystals are eye-clean and others are opaque, and how gemologists assess clarity.
Why Some Mozambique Ruby Crystals Are Transpare...
Mozambique ruby transparency depends on internal inclusions, fractures, and growth zoning. Learn why some crystals are eye-clean and others are opaque, and how gemologists assess clarity.