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Turquoise United Conference 2023
An Update on Color in Gems. Part 2: Colors Involving Multiple Atoms and Color Centers
This is the second part in a three-part series on the origin of color in gem materials.
A Unique Double Cat’s-Eye Emerald
The Tokyo lab examined a stunning double cat’s-eye emerald whose chatoyancy was created both by its cut and its inclusions.
Fissure with Moiré Pattern in Spinel
A precipitation of an unidentified mineral creates a complex moiré pattern in a fissure of a purple spinel.
Etch Pits in Heliodor and Green Beryl from the Volyn Pegmatites, Northwest Ukraine: A Diagnostic Feature
Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.
Faceted Octahedral Diamond with Octahedral-Shaped Inclusion
Creative faceting highlights an octahedral-shaped cloud inclusion in a 2.01 ct diamond octahedron.
Bismuth Glass-Filled Burmese Star Ruby
The Hong Kong laboratory recently examined a Burmese star ruby incorporating a significant amount of bismuth glass.
The Geographic Origin of Diamonds, Sapphire from China, and Pigments Sourced from Gem Materials
Unusual Purple Fluid in Quartz
Numerous negative crystals in a pear-shaped quartz host brightly colored purple liquid.
Glass Imitation of Star Sapphire
Internal Structures of Known Pinctada maxima Pearls: Natural Pearls from Wild Marine Mollusks
Presents the internal characteristics of natural P. maxima pearls, obtained from real-time microradiography (RTX) and X-ray computed microtomography (µ-CT) analysis of 774 samples.
X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages, and Limitations
X-ray computed microtomography reveals the internal features of pearls with great detail.