Research Article Search Results
Reversible Photochromism in a Heat-Treated Sri Lankan Sapphire
A heat-treated Sri Lankan sapphire exhibits a rare reversible color change from very light blue to light yellow after short-wave UV exposure.
Heat-Treated Red Spinel
A purplish red oval mixed cut submitted as a ruby was recently identified as heat-treated spinel at the Hong Kong laboratory.
Twinned Calcite with Realgar Inclusions
Vivid red to orange-red realgar inclusions are observed in a contact-twinned calcite host.
“Fungal Hyphae” in a Mabe Pearl
A mabe pearl exhibits an unusual pattern of intersecting subsurface channels, likely formed by shell-boring parasites.
Leaf-Like Imprint on Non-Nacreous Pearl
Microscopic examination of a non-nacreous natural pearl reveals a distinctive pattern resembling leaves with intricate vein structures.
Reticulated Pattern on Pearl’s Surfaces
Several natural pearls in a multistrand necklace display an unusual reticulated surface texture with deep indentations and prominent ridges.
Two-Phase Inclusion in Peridot
Microscopic examination of a Pakistani peridot reveals a rare cylindrical fluid inclusion with a freely moving gas bubble.
Colorful Mosaic Pattern in Heated Orange Sapphire
Thin-film decrepitation inclusions create a colorful scene in a beryllium-diffused orange sapphire.
“Shooting Stars” in Sapphire
Numerous Rose channels against a backdrop of scattered zircon crystals produce a striking night-sky effect in a color-change sapphire.
Vesuvianite in Sapphire
The first known occurrence of a vesuvianite inclusion in sapphire is documented.
Distinctive Fluorescent Crystal Inclusions in Spinel
A cluster of transparent inclusions in spinel displays various fluorescent colors under short-wave ultraviolet light.
Quarterly Crystal: Chromite in Diamond
A partially etched colorless diamond octahedron hosts numerous opaque black chromite crystals.
